Method and system for transmitting and receiving broadcast service data in a wireless communication system
A method and system are provided for transmitting broadcast service data in a wireless communication system using an Orthogonal Frequency Division Multiple Access (OFDMA) scheme in which data transmission is achieved through a downlink and an uplink within one frame. The system being connected to a broadcast server. The system and method include allocating a connection identifier (CID) to each broadcast service for identification of a broadcast service packet transmitted over the downlink, and transmitting broadcast service information for each broadcast service; and receiving a broadcast packet from the broadcast server, and transmitting a physical layer transmission information element (DL-MAP) including a broadcast service CID for the broadcast packet through the downlink0.
Latest Samsung Electronics Patents:
This application claims the benefit under 35 U.S.C. § 119(a) of an application entitled “Method and System for Transmitting and Receiving Broadcast Service Data in a Wireless Communication System” filed in the Korean Intellectual Property Office on May 7, 2004 and assigned Serial No. 2004-32404, the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates generally to a method and system for transmitting and receiving data in a wireless communication system. In particular, the present invention relates to a method and system for transmitting and receiving broadcast service data in a wireless communication system.
2. Description of the Related Art
In a wireless communication system, the term “data” generally refers to unicast data transmitted from one subscriber station (SS) or one system to another SS or another system. Unicast data transmitted such that it can be received at only an individual SS, is transmitted at the request of a corresponding user. However, with the development of wireless communication technology, there has been a growing demand for receiving broadcast service provided in the public network even in a wireless communication system. The broadcast service, unlike the unicast service, is characterized by a plurality of SSs being able to receive the same traffic.
A mobile communication system using cellular technology is presented as a typical example of a wireless communication system. The cellular mobile communication system has developed from the conventional system capable of supporting only voice communication into an advanced system capable of supporting high-speed data transmission. Recently, research relating to mobile communication systems has been conducted to provide a broadcast service using 3rd Generation Partnership Project (3GPP) and 3rd Generation Partnership Project 2 (3GPP2), which are standardization groups for a 3rd generation (3G) mobile communication system.
However, the mobile communication system has a difficulty in efficiently providing the broadcast service in terms of a data rate. That is, the mobile communication system basically uses a Code Division Multiple Access (CDMA) scheme, and its frequency band is fixed. The CDMA mobile communication system spreads data using Walsh codes prior to transmission. The Walsh codes are limited resources, and extension of the codes thereof is very difficult.
Accordingly, there is a demand for a new scheme, which is not simply dependent on the CDMA scheme, to provide a broadcast service in a wireless communication system.
SUMMARY OF THE INVENTIONIt is, therefore, an object of the present invention to provide a method and system for efficiently transmitting and receiving a broadcast service in a wireless communication system.
It is another object of the present invention to provide a method and system for transmitting and receiving a broadcast service at high speed in a wireless communication system.
It is further another object of the present invention to provide a method and system for transmitting and receiving a broadcast service without the influence of spreading code resources in a mobile communication system.
According to one aspect of the present invention, there is provided a method for transmitting broadcast service data in a wireless communication system using an Orthogonal Frequency Division Multiple Access (OFDMA) scheme in which data transmission is achieved through a downlink and an uplink within one frame, the system being connected to a broadcast server. The method comprising the steps of allocating a connection identifier (CID) to each broadcast service for identification of a broadcast service packet transmitted over the downlink, and transmitting broadcast service information for each broadcast service; and receiving a broadcast packet from the broadcast server, and transmitting a physical layer transmission information element (DL-MAP) comprising a broadcast service CID for the broadcast packet through the downlink.
According to another aspect of the present invention, there is provided a method for receiving broadcast service data in a wireless communication system using an Orthogonal Frequency Division Multiple Access (OFDMA) scheme in which data transmission is achieved through a downlink and an uplink within one frame. The system being connected to a broadcast server for transmitting a broadcast service packet and its associated broadcast service connection identifier (CID) using a physical layer transmission information element (DL-MAP). The method comprising the steps of receiving broadcast service information for a desired broadcast service from the wireless communication system; detecting a desired broadcast service CID from a DL-MAP for frames received through the downlink; and receiving a broadcast service packet by acquiring position information of a broadcast service packet using the broadcast service CID when there is a packet comprising the broadcast service CID.
According to further another aspect of the present invention, there is provided a system for providing broadcast service data in a wireless communication system using an Orthogonal Frequency Division Multiple Access (OFDMA) scheme in which data transmission is achieved through a downlink and an uplink within one frame. The system comprising a broadcast server for providing broadcast service data; and a broadcast service controller for receiving broadcast content data from the broadcast server, storing the received broadcast content data in a buffer thereof, and providing a broadcast service packet and configuration information of the broadcast service packet through the downlink of the wireless communication system if the broadcast content data stored in the buffer satisfies a predetermined condition.
The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:
Throughout the drawings, the same element is designated by the same reference numeral or character.
DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTSSeveral embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein has been omitted for conciseness.
The present invention provides a system and method for providing a broadcast service in a wireless communication system. The present invention supports a broadcast service at a high data rate which is higher than that of the 3rd generation (3G) mobile communication system having a mid/low data rate compared with that of a system using Institute of Electrical and Electronics Engineers (IEEE) 802.16 technology (hereinafter referred to as an “802.16 system.” The 802.16-REVd/D4-2004 standard is incorporated herein by reference. Herein, a description will be made of an Orthogonal Frequency Division Multiplexing (OFDM) scheme in addition to several physical layer technologies used in the 3G mobile communication system. Also, a method for efficiently reducing power consumption in the 3G mobile communication system will be described. In addition, to help understand the present invention, a brief explanation for some abbreviations or acronyms used in the present application is provided as follows:
-
- MBS: stands for Multicast and Broadcast Service.
- DL-MAP: stands for Down Link Map, which is a MAC (Media Access Control) layer message for informing a location and occupied region of a burst transmitted in a frame and a MCS (Modulation and Coding Scheme) scheme.
- DIUC: stands for Downlink Interval Usage Code, which is a field used in DL-MAP and for expressing MCS information for each burst.
The following description presents (1) a method for transmitting a broadcast service and identifying a broadcast packet, (2) a method for continuously receiving a broadcast service, (3) a method for efficiently reducing reception power, and (4) a method for increasing efficiency of reception power using a physical layer transmission information element in a dynamic broadcast transmission method.
[1] Method for Transmitting Broadcast Service and Identifying Broadcast Packet
In a high-speed wireless communication system directed primarily at unicast service, in order to support a broadcast service, a base station (BS) should be able to indicate whether a transmission physical layer frame comprises a broadcast packet and whether a particular packet is a broadcast packet. To this end, the BS should inform subscriber stations (SSs) when a broadcast packet is transmitted. As an alternative method, the BS can indicate a physical layer frame over which a broadcast packet is transmitted, by recording information indicating the inclusion of a broadcast packet in the physical layer frame over which the corresponding broadcast packet is transmitted, before transmitting the physical layer frame. Therefore, the BS writes an identifier (ID) allocated for broadcast in a header of a medium access control (MAC) layer packet for each of broadcast services included in a physical layer frame so that SSs can determine whether a particular packet is a broadcast packet.
In the 802.16 system, an exemplary system to which the present invention is applied, the method for identifying a broadcast service packet allocates a particular connection ID (CID) to each broadcast service and writes the allocated CID in a MAC layer packet for each broadcast packet prior to transmission. In addition, the method writes information indicating transmission of a broadcast service in a physical layer transmission information element (DL-MAP) through which the broadcast services are transmitted so that an SS receiving the physical layer transmission information element can determine whether a broadcast packet is included in a corresponding frame.
Referring to
In this section, a description will be made of a method for writing a point or location of a broadcast service packet in a physical layer frame using the physical layer transmission information element illustrated in
The present invention provides a method for setting a value of the ‘INC_CID’ field indicating inclusion of a CID among the fields of the physical layer transmission information element, to ‘0’, and indicates a point where a broadcast service packet is transmitted, using the ‘OFDMA Symbol offset’ field, the ‘No. OFDMA Symbols’ field, the ‘Subchannel offset’ field, and the ‘No. Subchannels’ field. A SS receiving the physical layer transmission information element set in this manner, can recognize that a packet transmitted at the point indicated by the ‘OFDMA Symbol offset’ field, the ‘No. OFDMA Symbols’ field, the ‘Subchannel offset’ field, and the ‘No. Subchannels’ field is a broadcast service packet, depending on the fact that a value of the ‘INC_CID’ field is set to ‘0’. In addition, the SS can recognize a point where the broadcast service packet is located, using the foregoing fields, and can receive the broadcast service packet according to the result. The SS determines whether corresponding broadcast is its desired broadcast through a CID in a MAC layer header of the received packet. If the received broadcast is its desired broadcast, the SS transmits the corresponding packet to an upper layer. However, if the received broadcast is not its desired broadcast, the SS discards the corresponding packet.
[2] Method for Continuously Receiving Broadcast Service
In a high-speed broadcast service system according to an embodiment of the present invention, a basic method for transmitting broadcast content is as follows. When broadcast service data is transmitted from a broadcast server to a broadcast service controller, the broadcast service controller stores the broadcast service data in its buffer. The broadcast service controller transmits the broadcast packet to SSs in each cell if a size of the data stored in its buffer is greater than a predetermined threshold, or at a transmission time determined based on Quality-of-Service (QoS) of the broadcast. In this method, for the time at which each broadcast is transmitted, transmission characteristics such as a data rate (source rate) and a transmission delay of the broadcast service change with the passage of time.
For example, if a source rate of a particular broadcast service instantaneously increases or decreases, a transmission time of the corresponding broadcast service instantaneously goes ahead or falls behind. If a transmission time for a particular broadcast service dynamically changes in this way, an SS cannot determine the time at which broadcast packets will be transmitted. Therefore, the SS should always monitor a broadcast channel transmitted in the downlink direction. As a result, the SS should receive and process even the downlink transmission frames which are not related to reception of the broadcast service, resulting in a considerable increase in its power consumption. Therefore, in the next section, a method for increasing the efficiency of reception power for a broadcast service will be described.
[3] Method for Increasing Efficiency of Reception Power
In this section, a description will be made of a semi-static broadcast transmission/reception technique capable of reducing power consumption by observing only the downlink transmission frames associated with a broadcast service in receiving the broadcast service by an SS in an 802.16 system according to an embodiment of the present invention.
(A) Method for Increasing Efficiency of Reception Power by Fixing Broadcast Transmission Time
A description will now be made of a broadcast transmission/reception method using the semi-static broadcast transmission technique according to an embodiment of the present invention to reduce use of reception power for SSs receiving a broadcast service.
In the method according to this embodiment of the present invention, a broadcast service controller previously determines a transmission time for each of broadcast services in service for a long time interval. The broadcast service controller transmits information on the transmission time in the message format to SSs via a BS on a unicast basis or on a broadcast basis. An SS receiving transmission time information for its desired broadcast services, can reduce power consumption due to unnecessary downlink reception by transitioning to an idle mode or a sleep mode. The SS in the idle mode or the sleep mode receives a downlink channel at the time when its desired broadcast is transmitted, in addition to the periodic data that the SS should necessarily receive in the idle mode or the sleep mode. In the other time period, the SS stops reception of a downlink channel, thereby minimizing power consumption due to reception of broadcast service.
A message used for receiving a broadcast service in this method will now be described.
The broadcast configuration message illustrated in
Referring to
In the MBS_Configuration_IE( ) block, an ‘N_MBS’ field indicates the number of broadcast services included in this block. As many ‘MBS CID’ fields as the number indicated by the ‘N_MBS’ field are included in the MBS_Configuration_IE( ) block, and the ‘MBS CID’ field indicates a CID corresponding to a particular broadcast. A ‘Physical Frequency’ field indicates information on a frequency band in which broadcast services corresponding to the CID are transmitted. A ‘Transmission start frame offset’ field indicates an interval between a physical layer frame in which a broadcast service is included and the current frame, and a ‘Transmission frame length’ field indicates the number of consecutive frames used for broadcast transmission. Finally, a ‘Transmission frame period index’ field indicates a period for which the corresponding broadcast is transmitted next.
(B) Method for Increasing Efficiency of Reception Power by Designating Point of Broadcast Data in a Physical Layer Frame
A description will now be made of a method for transmitting, to an SS, information on a point or location in broadcast data in a physical layer frame over which broadcast is transmitted, so as to reduce use of reception power for SSs desiring to receive the broadcast. The broadcast service controller according to an embodiment of the present invention designates a transmission time for each of broadcast services in service plus a transmission point of a corresponding broadcast in a physical layer frame for the transmission time, and transmits information on the transmission time to SSs via a BS on a unicast basis or on a broadcast basis. Therefore, each SS receives a transmission time plus a transmission point in a frame for each of its desired broadcast services. Thereafter, when receiving a corresponding frame at a transmission time of the corresponding broadcast, the SS receives only the channels in the previously designated point, thereby minimizing power consumption needed for reception of a physical layer frame over which the broadcast is transmitted. When a particular SS operates in an idle mode or a sleep mode, the SS selectively receives only the channels in the previously designated point in a physical layer frame at the time when its desired broadcast is transmitted, in addition to the periodic data that the SS should necessarily receive in the idle mode or the sleep mode, thereby minimizing power consumption due to reception of broadcast service.
In order to selectively receive only the channels in the point designated in a physical layer frame at the time when a desired broadcast is transmitted, the foregoing broadcast configuration block should be modified.
(C) Broadcast Reception Process
A description will now be made of a signaling procedure for efficiently transmitting/receiving broadcast traffic using the foregoing method.
Referring to
[4] Method for Increasing Efficiency of Reception Power Using Physical Layer Transmission Information in Dynamic Broadcast Transmission Method
In this section, a description will be made of a method for reducing power consumption by observing only the downlink transmission frames associated with a broadcast service in receiving the broadcast service by an SS in an 802.16 system according to a second embodiment of the present invention. The second embodiment provides a method for modifying and transmitting a physical layer transmission information element of a physical layer frame over which a broadcast is transmitted during broadcast transmission.
(A) Method for Increasing Efficient of Reception Power Using Through Modification of Physical Layer Transmission Information
The second embodiment of the present invention records, in a physical layer transmission information element (DL-MAP) of a physical layer frame over which a broadcast is transmitted, information on a time at which the broadcast services transmitted over the frame will be transmitted next, so as to reduce use of reception power for SSs desiring to receive the broadcast. In this method, an SS receiving the physical layer frame can determine the time at which it should observe a downlink channel to receive a particular broadcast even through the SS does not continuously receive the downlink channel. That is, a BS specifies, in a physical layer transmission information element of a physical layer frame for transmitting particular broadcasts, e.g., Munhwa Broadcasting Corporation (MBC) and Korean Broadcasting System (KBS), a time in the physical layer frame, at which MBC is transmitted next, and a time in the physical layer frame, at which KBS is transmitted next, and then transmits the time information-specified physical layer transmission information element to SSs in its cell. A SS receiving the time information, receives MBC and KBS and analyzes physical layer transmission information included in the corresponding physical layer frame thereby extracting information on the next time at which MBC and KBS will be transmitted.
In order to support the foregoing method, it is necessary to modify a format of a physical layer transmission information element (BMAP_IE).
An ‘Offset’ field of the BMAP_IE illustrated in
Aside from the predefined ‘Offset’ field, a CID for a broadcast can be described in the physical layer transmission information element BMAP_IE of
(B) Method for Increasing Efficiency of Reception Power Through Modification of MAC Layer Header
In order to reduce use of reception power for SSs desiring to receive a broadcast, a BS writes, in a MAC Layer header of a transmission broadcast packet, information on a time at which the broadcast service will be transmitted next in the packet. In this method, an SS receiving the broadcast packet can determine the next time when it should observe a downlink channel to receive a particular broadcast, even though the SS does not continuously receive the downlink channel. That is, when transmitting two MAC layer packets including particular broadcasts, for example, MBC and KBS, with one physical layer frame, a BS specifies a time of the physical layer frame, at which MBC will be transmitted next, in a header of a MAC layer packet comprising MBC, and specifies a time of the physical layer frame, at which KBS will be transmitted next, in a header of a MAC layer packet comprising KBS, and transmits the time information-specified MAC layer packets to each of the SSs. A SS receiving the time information, receives MBC and KBS and analyzes information on the corresponding MAC layer packet thereby extracting information on the next time at which MBC and KBS will be transmitted.
A description will now be made of a format of a MAC layer header used in the 802.16 system.
Referring to
In the MAC layer header for a broadcast packet, if a specific bit, for example, a bit #0 or a bit #4, of the ‘Type’ field is set to ‘1’, or if one of the two ‘RSV’ fields is set to ‘1’, it is used as a sub-header that specifies the next transmission time of the corresponding broadcast.
A method for using the sub-header will now be described.
Referring to
Therefore, an SS receiving the MAC layer header can determine the next transmission time of a broadcast associated with a corresponding CID (MBC CID) using the ‘Offset’ field. That is, if the current frame over which a broadcast has been received is an nth frame, the SS can recognize that a frame at which the broadcast will arrive next becomes an {(n+Offset) mod 224 (=maximum frame number+1)}th frame.
(C) Process of Receiving Broadcast with Efficient Reception Power Using Physical Layer Transmission Information
A description will now be made of a process of transmitting/receiving broadcast packets between an SS and a BS using physical layer transmission information in a dynamic broadcast transmission method.
Referring to
As can be understood from the foregoing description, the method can provide a high-speed broadcast service in the 802.16 system, for example. In addition, the novel method transmits broadcast packets using a dynamic or semi-static method so that a reception apparatus can efficiently reduce reception power.
While the invention has been shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims
1. A method for transmitting broadcast service data in a wireless communication system using an Orthogonal Frequency Division Multiple Access (OFDMA) scheme, the method comprising the steps of:
- generating a frame of a current transmission of a broadcast service, the frame including a broadcast packet and a physical layer transmission information element (DL_MAP) comprising a broadcast service connection identifier (CID) for the broadcast packet and information indicating a data region where the broadcast packet is located in a the frame,
- wherein the frame further comprising a broadcast configuration message including timing information associated with a next transmission of the broadcast service relative to the current transmission; and
- transmitting the frame to at least one mobile station.
2. The method of claim 1, wherein the data region information comprises an offset of an OFDMA symbol, a number of OFDMA symbol, an offset of a subchannel and a number of subchannels.
3. The method of claim 1, wherein the timing information associated with the next transmission comprises an offset value indicating a difference between the current frame and a next frame at which the broadcast service is provided and a period value indicating period between the frames.
4. The method of claim 1, wherein the wireless communication system is compliant with an Institute of Electrical and Electronics Engineers (IEEE) 802.16 standard.
5. A method for receiving broadcast service data in a wireless communication system using an Orthogonal Frequency Division Multiple Access (OFDMA) scheme, the method comprising the steps of:
- receiving, by a receiver, a frame of a current transmission of a broadcast service, the frame including a broadcast packet and a physical layer transmission information element (DL_MAP) comprising a broadcast service connection identifier (CID) for the broadcast packet and information indicating a data region where the broadcast packet is located in a frame,
- wherein the frame further comprising a broadcast configuration message including timing information associated with a next transmission of the broadcast service relative to the current transmission.; and
- receiving, by the receiver, a next frame of the next transmission including broadcast packets according to the timing information associated with the next-transmission.
6. The method of claim 5, wherein the data region information comprises an offset of an OFDMA symbol, a number of OFDMA symbol, an offset of a subchannel and a number of subchannels.
7. The method of claim 5, wherein the timing information associated with the next-transmission comprises an offset value indicating a difference between the current frame and a next frame at which the broadcast service is provided and a period value indicating period between the frames.
8. The method of claim 7, further comprising a step of periodically receiving a frame including broadcast packets according to the period value.
9. The method of claim 5, wherein the wireless communication system is complaint with an Institute of Electrical and Electronics Engineers (IEEE) 802.16 standard.
10. A method for transmitting broadcast service data in a wireless communication system using an Orthogonal Frequency Division Multiple Access (OFDMA) scheme, the method comprising the steps of:
- transmitting, by a transmitter, a current frame of a current transmission of a broadcast service, the current frame including a broadcast packet and a physical layer transmission information element (DL_MAP) comprising a broadcast service connection identifier (CID) for the broadcast packet and information indicating a data region where the broadcast packet is located in a frame;
- wherein the DL_MAP further comprising a broadcast MAP information element including an offset value indicating a difference between a current frame and a next frame of a next transmission at which the broadcast service is provided.
11. The method of claim 10, wherein the data region information comprises an offset of an OFDMA symbol, a number of OFDMA symbol, an offset of a subchannel and a number of subchannels.
12. The method of claim 10, wherein the wireless communication system is compliant with an Institute of Electrical and Electronics Engineers (IEEE) 802.16 standard.
13. A method for receiving broadcast service data in a wireless communication system using an Orthogonal Frequency Division Multiple Access (OFDMA) scheme, the method comprising the steps of:
- receiving, by a receiver, a current frame of a current transmission of a broadcast service, the current frame including a broadcast packet and a physical layer transmission information element (DL_MAP) comprising a broadcast service connection identifier (CID) for the broadcast packet and information indicating a data region where the broadcast packet is located in a frame;
- wherein the DL_MAP further comprising a broadcast MAP information element including a offset value indicating a timing difference between the current frame and a next frame of a next transmission at which the broadcast service is provided; and
- receiving, by a receiver, the next frame including broadcast packets according to the offset value.
14. The method of claim 13, wherein the data region information comprises an offset of an OFDMA symbol, a number of OFDMA symbol, an offset of a subchannel and a number of subchannels.
15. The method of claim 13, wherein the wireless communication system is compliant with an Institute of Electrical and Electronics Engineers (IEEE) 802.16 standard.
16. A method for transmitting broadcast service data in a wireless communication system using an Orthogonal Frequency Division Multiple Access (OFDMA) scheme, the method comprising the steps of:
- transmitting, by a transmitter, a current of a transmission of a broadcast service, the current frame including a broadcast packet and a physical layer transmission information element (DL_MAP) comprising a broadcast service connection identifier (CID) for the broadcast packet and information indicating a data region where the broadcast packet is located in a frame,
- wherein the broadcast packet comprising a MAC Layer header including an offset value indicating a timing difference between the current frame and a next frame of a next transmission at which the broadcast service is provided.
17. The method of claim 16, wherein the data region information comprises an offset of an OFDMA symbol, a number of OFDMA symbol, an offset of a subchannel and a number of subchannels.
18. The method of claim 16, wherein the MAC Layer header further including the CID.
19. The method of claim 16, wherein the wireless communication system is compliant with an Institute of Electrical and Electronics Engineers (IEEE) 802.16 standard.
20. A method for receiving broadcast service data in a wireless communication system using an Orthogonal Frequency Division Multiple Access (OFDMA) scheme, the method comprising the steps of:
- receiving, by a receiver, a current frame of a current transmission of a broadcast service, the current frame including packet and a physical layer transmission information element (DL_MAP) comprising a broadcast service connection identifier (CID) for the broadcast packet and information indicating a data region where the broadcast packet is located in a frame,
- wherein the broadcast packet comprising a MAC Layer header including an offset value indicating a difference between the current frame and a next frame of a next transmission at which the broadcast service is provided; and
- receiving, by the receiver, the next frame including broadcast packets according to the offset value.
21. The method of claim 20, wherein the data region information comprises an offset of an OFDMA symbol, a number of OFDMA symbol, an offset of a subchannel and a number of subchannels.
22. The method of claim 20, wherein the MAC Layer header further including the CID.
23. The method of claim 20, wherein the system is compliant with an Institute of Electrical and Electronics Engineers (IEEE) 802.16 standard.
24. A system for transmitting broadcast service data in a wireless communication system using an Orthogonal Frequency Division Multiple Access (OFDMA) scheme, the system comprises:
- a transmitter for transmitting a frame of a current transmission of a broadcast service, the frame including a broadcast packet and a physical layer transmission information element (DL_MAP) comprising a broadcast service connection identifier (CID) for the broadcast packet and information indicating a data region where the broadcast packet is located in a frame, wherein the frame including timing information associated with a next transmission of the broadcast service relative to the current transmission; and
- a receiver for receiving a next frame of the next transmission including broadcast packets according to the timing information associated with the next transmission.
25. The method of claim 24 wherein the timing information associated with the next transmission comprises a offset value indicating a difference between a current frame and a next frame at which the broadcast service is provided and a period value indicating a time period between the frames.
26. The method of claim 5, wherein the timing information associated with the next transmission comprises a value indicating a difference between the current frame and the next frame at which the broadcast service is provided.
27. An apparatus for transmitting broadcast service data in a broadcasting system, the apparatus comprising:
- a processor for generating a frame of a current transmission of a broadcast service, the frame including broadcast service data and information for physical layer transmission, the information comprising an identifier for identifying the broadcast service and information indicating a data region where the broadcast service data is located in the frame; and
- a transmitter for transmitting the frame to at least one receiver,
- wherein the information for physical layer transmission further comprises timing information indicating an interval between a frame of a next transmission of the broadcast service and the frame of the current transmission.
28. The apparatus of claim 27, wherein the data region information comprises an offset of an OFDMA symbol, a number of OFDMA symbols, an offset of a subchannel and a number of subchannels.
29. The apparatus of claim 27, wherein the timing information associated with the next transmission comprises a value indicating period between the frames at which the broadcast service is provided.
30. The apparatus of claim 27, wherein the timing information associated with the next transmission comprises a value indicating a difference between the current frame and the next frame at which the broadcast service is provided.
31. An apparatus for receiving broadcast service data in a broadcasting system, the apparatus comprising:
- a receiver for receiving a frame of a current transmission of a broadcast service; and
- a processor for processing the frame including broadcast service data and information for physical layer transmission, the information comprising an identifier for identifying the broadcast service, information indicating a data region where the broadcast service data is located in the frame and timing information indicating an interval between a frame of a next transmission of the broadcast service and the frame of the current transmission,
- wherein the receiver receives the frame of the next transmission based on the timing information.
32. The apparatus of claim 31, wherein the data region information comprises an offset of an OFDMA symbol, a number of OFDMA symbols, an offset of a subchannel and a number of subchannels.
33. The apparatus of claim 31, wherein the timing information associated with the next transmission comprises a value indicating period between the frames at which the broadcast service is provided.
34. The apparatus of claim 31, wherein the timing information associated with the next transmission comprises a value indicating a difference between the current frame and the next frame at which the broadcast service is provided.
35. A method for transmitting broadcast service data in a broadcasting system, the method comprising the steps of:
- generating, by a transmitter, a frame of a current transmission of a broadcast service, the frame including broadcast service data and information for physical layer transmission, the information comprising an identifier for identifying the broadcast service and information indicating a data region where the broadcast service data is located in the frame,
- wherein the information for physical layer transmission further comprises timing information indicating an interval between a frame of a next transmission of the broadcast service and the frame of the current transmission; and
- transmitting the frame of the current transmission to at least one receiver.
36. The method of claim 35, wherein the information indicating a data region comprises an offset of an OFDMA symbol, a number of OFDMA symbol, an offset of a subchannel and a number of subchannels.
37. The method of claim 35, wherein the timing information associated with the next transmission comprises a value indicating period between the frames at which the broadcast service is provided.
38. The method of claim 35, wherein the timing information associated with the next transmission comprises a value indicating a difference between the current frame and the next frame at which the broadcast service is provided.
39. A method for receiving broadcast service data in a broadcasting system, the method comprising the steps of:
- receiving, by a receiver, a frame of a current transmission of a broadcast service, the frame including broadcast service data and information for physical layer transmission, the information comprising an identifier for identifying the broadcast service and information indicating a data region where the broadcast service is located in the frame,
- wherein the information for physical layer transmission further comprises timing information indicating an interval between a frame of a next transmission of the broadcast service and the frame of the current transmission; and
- receiving, by the receiver, the frame of the next transmission based on the timing information.
40. The method of claim 39, wherein the information indicating a data region comprises an offset of an OFDMA symbol, a number of OFDMA symbol, an offset of a subchannel and a number of subchannels.
41. The method of claim 39, wherein the timing information associated with the next transmission comprises a value indicating period between the frames at which the broadcast service is provided.
5602836 | February 11, 1997 | Papadopoulos et al. |
5918170 | June 29, 1999 | Oksanen et al. |
6243389 | June 5, 2001 | Khana et al. |
6308066 | October 23, 2001 | Ranta et al. |
6505058 | January 7, 2003 | Willey |
6522670 | February 18, 2003 | Jokinen et al. |
7020102 | March 28, 2006 | Tuomainen et al. |
7792121 | September 7, 2010 | Thompson et al. |
20010022781 | September 20, 2001 | Makipaa |
20020116719 | August 22, 2002 | Drapper et al. |
20050201269 | September 15, 2005 | Shim et al. |
1020020068341 | August 2002 | KR |
1020030002303 | January 2003 | KR |
1020040007403 | January 2004 | KR |
WO0213440 | February 2002 | WO |
WO03045064 | May 2003 | WO |
- IEEE 100 The Authoritative Dictionary of IEEE Standards Terms, IEEE, 7th edition, 2000, 3 pages.
- IEEE Standard for Local and Metropolitan Area Networks, 802.16a, Part 16,(2003).
- Yong Chang et al., “Enhanced Broadcast/Multicast Capabilities”, IEEE 802.16 Broadband Wireless Access Working Group, XP002589778 (2004).
- 802.16a, Part 16, IEEE Standard for Local and metropolitan area networks, Apr. 1, 2003, IEEE, pp. 1-318.
Type: Grant
Filed: Jun 29, 2011
Date of Patent: Feb 25, 2014
Assignee: Samsung Electronics Co., Ltd. (Suwon-si)
Inventors: Jung-Soo Jung (Seoul), Yu-Chul Kim (Seoul), Dae-Gyun Kim (Seongnam-si), Beom-Sik Bae (Suwon-si), Yong Chang (Seongnam-si), Geun-Hwi Lim (Seongnam-si), Jung-Je Son (Seongnam-si)
Primary Examiner: Dmitry H Levitan
Application Number: 13/067,854
International Classification: H04B 7/00 (20060101);