METHOD AND APPARATUS FOR TRANSMITTING SIGNALS OF USER EQUIPMENT (UE) CONFIGURED TO PERFORM D2D COMMUNICATION IN WIRELESS COMMUNICATION SYSTEM
A method for transmitting a signal by a device-to-device (D2D) user equipment (UE) configured to perform D2D communication in a wireless communication system includes transmitting a signal after application of a first timing advance (TA) value for D2D communication, wherein the first timing advance (TA) value for the D2D communication is associated with a second timing advance (TA) value applied when the UE transmits an uplink signal to a base station (BS).
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The present invention relates to a wireless communication system, and more particularly to a method and apparatus for transmitting signals of a user equipment (UE) configured to perform device-to-device (D2D) communication.
BACKGROUND ARTA user equipment (UE) existing in a cell of a cellular communication system connects to a base station (BS), receives control information for data communication from the BS, and transmits and receives data to and from the BS, resulting in communication between the UE and the BS. That is, since the UE transmits and receives data to/from the BS, the UE must transmit data to the BS and then the BS must transmit the received data to another UE in such a manner that data communication between one UE and another cellular UE is achieved through the BS. In this way, since one UE can transmit data to another UE through the BS, the BS schedules channels and resources for data transmission/reception and transmits channel and resource scheduling information to each UE.
Device-to-Device (D2D) communication establishes a direct link between user equipments (UEs) such that voice, data, etc. are directly communicated between UEs without passing through an evolved NodeB (eNB). D2D communication may include UE-to-UE communication, Peer-to-Peer communication, and the like. In addition, the D2D communication can be applied to Machine-to-Machine (M2M) communication, Machine Type Communication (MTC), etc.
D2D communication has recently been used as one method for solving BS loads caused by rapidly increasing data traffic. For example, differently from the legacy wireless communication system, D2D communication enables data to be communicated between two or more devices without passing through the BS, resulting in reduction of network overload.
In addition, with the introduction of D2D communication, the number of BS procedures is reduced, power consumption of devices that participate in D2D is reduced, the data transfer rate is increased, the network accommodation capability is increased, and load dissipation and cell coverage extension are expected.
DISCLOSURE Technical ProblemAccordingly, the present invention is directed to a method and apparatus for transmitting signals of a user equipment (UE) configured to perform D2D communication in a wireless communication system that substantially obviates one or more problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide a method for enabling a UE configured to perform D2D communication to minimize interference applied to a legacy wireless communication system.
It is to be understood that technical objects to be achieved by the present invention are not limited to the aforementioned technical objects and other technical objects which are not mentioned herein will be apparent from the following description to one of ordinary skill in the art to which the present invention pertains.
Technical SolutionThe object of the present invention can be achieved by providing a method for transmitting a signal by a device-to-device (D2D) user equipment (UE) configured to perform D2D communication in a wireless communication system, the method including: transmitting a signal after application of a first timing advance (TA) value for D2D communication, wherein the first timing advance (TA) value for the D2D communication is associated with a second timing advance (TA) value applied when the UE transmits an uplink signal to a base station (BS).
In another aspect of the present invention, a user equipment (UE) apparatus configured to perform D2D communication in a wireless communication system includes: a transmission module; and a processor, wherein the processor transmits a signal after application of a first timing advance (TA) value for D2D communication, and the first timing advance (TA) value for the D2D communication is associated with a second timing advance (TA) value applied when the UE transmits an uplink signal to a base station (BS).
The first and second technical aspects may include all or some parts of the following description.
The timing advance (TA) value for D2D communication may be identical to the second timing advance (TA) value.
The timing advance (TA) value for D2D communication may be achieved by adding a predetermined value to the second timing advance (TA) value.
The predetermined value may be either an integer multiple of a cyclic prefix (CP) or a value indicated by the BS.
The timing advance (TA) value for D2D communication may be the highest one from among values that are BS-established as the second timing advance (TA) value.
The second timing advance (TA) value may be received as a MAC control element.
A frequency band used when the first timing advance (TA) value is applied to signal transmission may be smaller than a frequency band used when the second timing advance (TA) value is applied to signal transmission.
It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
Advantageous EffectsAs is apparent from the above description, the embodiments of the present invention can enable one UE for signal reception from among a plurality of UEs for D2D communication to reduce interference from another UE of a legacy wireless communication system.
It will be appreciated by persons skilled in the art that the effects that can be achieved with the present invention are not limited to what has been particularly described hereinabove and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings.
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the principle of the invention.
The following embodiments are proposed by combining constituent components and characteristics of the present invention according to a predetermined format. The individual constituent components or characteristics should be considered optional factors on the condition that there is no additional remark. If required, the individual constituent components or characteristics may not be combined with other components or characteristics. Also, some constituent components and/or characteristics may be combined to implement the embodiments of the present invention. The order of operations to be disclosed in the embodiments of the present invention may be changed. Some components or characteristics of any embodiment may also be included in other embodiments, or may be replaced with those of the other embodiments as necessary.
The embodiments of the present invention are disclosed on the basis of a data communication relationship between a base station and a terminal. In this case, the base station is used as a terminal node of a network via which the base station can directly communicate with the terminal. Specific operations to be conducted by the base station in the present invention may also be conducted by an upper node of the base station as necessary.
In other words, it will be obvious to those skilled in the art that various operations for enabling the base station to communicate with the terminal in a network composed of several network nodes including the base station will be conducted by the base station or other network nodes other than the base station. The term “Base Station (BS)” may be replaced with a fixed station, Node-B, eNode-B (eNB), or an access point as necessary. The term “relay” may be replaced with the terms Relay Node (RN) or Relay Station (RS). The term “terminal” may also be replaced with a User Equipment (UE), a Mobile Station (MS), a Mobile Subscriber Station (MSS) or a Subscriber Station (SS) as necessary.
It should be noted that specific terms disclosed in the present invention are proposed for convenience of description and better understanding of the present invention, and the use of these specific terms may be changed to other formats within the technical scope or spirit of the present invention.
In some instances, well-known structures and devices are omitted in order to avoid obscuring the concepts of the present invention and important functions of the structures and devices are shown in block diagram form. The same reference numbers will be used throughout the drawings to refer to the same or like parts.
Exemplary embodiments of the present invention are supported by standard documents disclosed for at least one of wireless access systems including an Institute of Electrical and Electronics Engineers (IEEE) 802 system, a 3rd Generation Partnership Project (3GPP) system, a 3GPP Long Term Evolution (LTE) system, an LTE-Advanced (LTE-A) system, and a 3GPP2 system. In particular, steps or parts, which are not described to clearly reveal the technical idea of the present invention, in the embodiments of the present invention may be supported by the above documents. All terminology used herein may be supported by at least one of the above-mentioned documents.
The following embodiments of the present invention can be applied to a variety of wireless access technologies, for example, CDMA (Code Division Multiple Access), FDMA (Frequency Division Multiple Access), TDMA (Time Division Multiple Access), OFDMA (Orthogonal Frequency Division Multiple Access), SC-FDMA (Single Carrier Frequency Division Multiple Access), and the like. CDMA may be embodied through wireless (or radio) technology such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA may be embodied through wireless (or radio) technology such as GSM (Global System for Mobile communication)/GPRS (General Packet Radio Service)/EDGE (Enhanced Data Rates for GSM Evolution). OFDMA may be embodied through wireless (or radio) technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (Evolved UTRA). UTRA is a part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (long term evolution) is a part of E-UMTS (Evolved UMTS), which uses E-UTRA. 3GPP LTE employs OFDMA in downlink and employs SC-FDMA in uplink. LTE-Advanced (LTE-A) is an evolved version of 3GPP LTE. WiMAX can be explained by IEEE 802.16e (WirelessMAN-OFDMA Reference System) and advanced IEEE 802.16m (WirelessMAN-OFDMA Advanced System). For clarity, the following description focuses on IEEE 802.11 systems. However, technical features of the present invention are not limited thereto.
The structure of a radio frame in 3GPP LTE system will be described with reference to
The number of OFDM symbols included in one slot may be changed according to the configuration of a Cyclic Prefix (CP). The CP includes an extended CP and a normal CP. For example, if the OFDM symbols are configured by the normal CP, the number of OFDM symbols included in one slot may be seven. If the OFDM symbols are configured by the extended CP, the length of one OFDM symbol is increased, the number of OFDM symbols included in one slot is less than that of the case of the normal CP. In case of the extended CP, for example, the number of OFDM symbols included in one slot may be six. If a channel state is unstable, for example, if a User Equipment (UE) moves at a high speed, the extended CP may be used in order to further reduce interference between symbols.
In case of using the normal CP, since one slot includes seven OFDM symbols, one subframe includes 14 OFDM symbols. At this time, the first two or three OFDM symbols of each subframe may be allocated to a Physical Downlink Control Channel (PDCCH) and the remaining OFDM symbols may be allocated to a Physical Downlink Shared Channel (PDSCH).
The structure of a type 2 radio frame is shown in
The structure of the radio frame is only exemplary. Accordingly, the number of subframes included in the radio frame, the number of slots included in the subframe or the number of symbols included in the slot may be changed in various manners.
Sounding Reference Signal (SRS)
An SRS is used for enabling an eNodeB to measure channel quality so as to perform frequency-selective scheduling on the uplink and is not associated with uplink data and/or control information transmission. However, the present invention is not limited thereto and the SRS may be used for improved power control or supporting of various start-up functions of UEs which are not recently scheduled. Examples of the start-up functions may include, for example, initial Modulation and Coding Scheme (MCS), initial power control for data transmission, timing advance, and frequency-semi-selective scheduling (scheduling for selectively allocating frequency resources in a first slot of a subframe and pseudo-randomly hopping to another frequency in a second slot).
In addition, the SRS may be used for downlink channel quality measurement on the assumption that the radio channel is reciprocal between the uplink and downlink. This assumption is particularly valid in a Time Division Duplex (TDD) system in which the same frequency band is shared between the uplink and the downlink and is divided in the time domain.
The subframe through which the SRS is transmitted by a certain UE within the cell is indicated by cell-specific broadcast signaling. 4-bit cell-specific “srsSubframeConfiguration” parameter indicates 15 possible configurations of the subframe through which the SRS can be transmitted within each radio frame. By such configurations, it is possible to provide adjustment flexibility of SRS overhead according to a network arrangement scenario. The remaining one (sixteenth) configuration of the parameters indicates the switch-off of the SRS transmission within the cell and is suitable for a serving cell for serving high-rate UEs.
The SRS is always transmitted on a last SC-FDMA symbol of the configured subframe. Accordingly, SRS and UL Demodulation RS (DMRS) are located on different SC-FDMA symbols. PUSCH data transmission is not allowed on the SC-FDMA symbol specified for SRS transmission and thus sounding overhead does not approximately exceed 7% even when it is highest (that is, even when SRS transmission symbols are present in all subframes).
Each SRS symbol is generated by the basic sequence (random sequence or Zadoff-Ch (ZC)-based sequence set) with respect to a given time unit and frequency band, and all UEs within the cell use the same basic sequence. At this time, the SRS transmission of the plurality of UEs within the cell in the same time unit and the same frequency band is orthogonally distinguished by different cyclic shifts of the base sequence allocated to the plurality of UEs. The SRS sequences of different cells can be distinguished by allocating different basic sequences to respective cells, but the orthogonality between the different basic sequences is not guaranteed.
D2D Communication
If D2D communication is introduced into the wireless communication system (for example, 3GPP LTE system or 3GPP LTE-A system), a detailed method for performing D2D communication will hereinafter be described in detail.
D2D communication supports D2D (or UE-to-UE) communication without passing through the eNB and reuses resources of the legacy wireless communication system (for example, 3GPP LTE or LTE-A), such that interference or disturbance must not occur in the legacy wireless communication system. Likewise, generating minimum interference in D2D communication by UE or eNB operating in the legacy wireless communication system is also of importance. Therefore, the following description proposes a variety of D2D communication methods capable of reducing interference between the D2D communication system and the legacy wireless communication system.
Various methods capable of minimizing interference generated in a UE configured to perform D2D communication on the condition that UE interference derives from the legacy wireless communication system will hereinafter be described in detail.
In
Referring to
In this case, the UL signal of the third UE (UE3) is applied not only to the eNB but also to the second UE (UE2) performing D2D communication. In this case, the UL signal of the third UE (UE3) may generate large interference when UE2 receives signals from UE1. Referring to
Interference generated in the B2D communication UE located close to the D2D communication UE may also occur in
As can be seen from
First, in order to enable the B2D communication UE to reduce ISI applied to the D2D communication UE, orthogonal time resources can be allocated for D2D communication and B2D communication. Although B2D communication users and D2D communication users coexist and frequency resources for the B2D communication are separated from frequency resources for the D2D communication, ISI encountered in the time interval is not solved, such that the above description can be understood as accessing in terms of time resources. For this purpose, time resources are allocated to a specific time interval in such a manner that D2D communication users can mainly occupy the time resources, and time resources are allocated to a specific time interval in such a manner that B2D communication users can mainly occupy the time resources. For example, subframes serving as time resources may be classified into subframes for D2D communication and subframes for B2D communication. In more detail, the eNB may indicate numbers of subframes for D2D communication through higher layer signaling. Alternatively, subframes are classified into two sets, one of the two sets may be established for B2D communication, and the other one of the two sets may be established for D2D communication. The set establishment may be transmitted to the UE through RRC signaling of the eNB.
In this case, the D2D communication subframes may be exclusively established in such a manner that the D2D communication subframes are not used for B2D communication at all. A predetermined degree may also be used for B2D communication as necessary. Assuming that some parts of D2D communication subframes are used for B2D communication, ACK/NACK, CQI report, PUCCH for Scheduling Request, and Sounding Reference Signal (SRS) for assisting a channel state measure may be used. In this case, whereas the D2D communication subframes are exclusively established, items defined in the legacy LTE/LTE-A system need not be changed.
Second, in order to enable the B2D communication UE to reduce ISI applied to the D2D communication UE, repetition signal transmission within a time interval may be achieved. The above-mentioned features can be applied not only to all OFDM symbols contained in one subframe but also to some OFDM symbols. In other words, when making the subframe composed of M OFDM symbols, N OFDM symbols may be transmitted in a different way from M-N OFDM symbols.
Implementation of repetition signal transmission will hereinafter be described in detail.
x
When a time-domain signal having a length, N_ofdm=N_cp+N_fft (where N_ofdm is the number of OFDM samples, N_cp is the number of CP samples, and N_fft is an FFT size), is transmitted, the transmission signal may be repeated within the FFT size (N_fft). For example, if the transmission signal is repeated two times, the (N_fft/2)-length signal may be repeated two times during the time N_fft.
In order to generate the repetition signal, the interleaved-type resource allocation method can be used, in which a signal in association with resources on a frequency domain is transmitted at an even-th RE, and no signal is transmitted at an odd-th RE. In this case, since power of the RE at which no signal is transmitted can be used at another RE at which a signal is transmitted, 3 dB boosting may be possible such that signal(s) can be transmitted at higher intensity. In addition, since the distance between frequency tones is longer, it is possible to provide more robust data transmission from inter carrier interference (ICI) caused by a frequency offset.
In addition, the above-mentioned repetition signal transmission may be used independently from orthogonal time resource allocation or may also be used along with the orthogonal time resource allocation. In more detail, in the case of establishing D2D subframes, when SRS and the like for B2D communication are transmitted even in the D2D subframes, unexpected interference may occur in the UE configured to perform D2D communication due to SRS transmission. That is, referring back to
Third, in order to enable the B2D communication UE to reduce ISI applied to the D2D communication UE, an OFDM symbol can be punctured.
SC-FDMA transmission is characterized in that a time-domain signal is converted into a frequency-domain signal through DFT-spreading and is reconverted into a time-domain signal through IFFT processing, resulting in maintenance of low PAPR. In this case, some signals from among time-domain signals obtained through IFFT processing can be punctured to reduce influence from ISI. For this purpose, when constructing the modulated symbol sequence prior to DFT spreading, a null signal is inserted into some modulated symbols from among the modulated symbol sequences, such that a specific part of the OFDM symbol obtained through IFFT processing can be punctured.
Assuming that the length of about N_A is punctured on the basis of the length of N_FFT, if signal puncturing is achieved at the ratio of about (a=N_TA/N_FFT), a null signal can be inserted into the symbol length of about (N_DFT×a) when the modulated symbol sequence is constructed for DFT spreading.
Various methods for minimizing interference generated in the D2D communication UE affected by the legacy wireless communication system have been disclosed as described above. A method for enabling the D2D communication UE to reduce influence applied to the legacy system will hereinafter be described. A representative method is definition of a TA value for D2D communication. If a signal arriving at the eNB deviates from the CP length as described above, UL orthogonality is not guaranteed such that unexpected interference may occur. In other words, a signal transmitted from the D2D communication UE to another UE may arrive at the eNB according to the UE location relationship. In this case, if a TA used by the D2D communication UE is not properly defined, interference may occur in the eNB.
For this purpose, the D2D communication UE may establish the same D2D-communication TA value (first TA value) as a B2D-communication TA value (second TA value) having received from the eNB as a MAC control element. In this case, although the UE transmits signals to another UE for D2D communication, signal transmission is achieved using a TA value adjusted for the eNB, resulting in reduction of interference applied to the eNB. However, the B2D communication UE may generate interference in the D2D communication UE, such that the above-mentioned methods can be simultaneously used.
Second, a UE configured to transmit a time-synchronization reference signal from among D2D communication UEs may set the highest TA value from among TA values defined for B2D communication to a D2D communication TA value.
Third, a UE configured to transmit a time-synchronization reference signal from among D2D communication UEs may use a TA value, that is obtained when a TA value received for B2D communication is added to a predetermined value, as a TA for D2D communication. For example, assuming that a TA value established for B2D communication is denoted by TA_B2D, signals can be transmitted in consideration of TA_add on the basis of TA_B2D. That is, TA_D2D=TA_B2D+TA_add may be established, where TA_add may be a fixed value or a designated value. If TA_add is set to a fixed value, TA_add may be established to have about CP duration or may also be established to have an integer multiple of the CP length. Alternatively, TA_add may be set to N (may be an integer) defined according to D2D duration and UE category. If TA_add is set to a designated value, a TA_add value may be indicated by the eNB as an example.
On the other hand, different frequency bands for B2D communication and D2D communication may be established independently from D2D communication methods or simultaneously with the D2D communication methods.
If a system bandwidth for B2D communication is set to M-MHz as an example of a method for establishing different frequency bands distinguished from D2D communication, the system bandwidth for D2D communication may be less than M. For example, a 20 MHz system bandwidth for B2D communication may be set to a 1.5 MHz system bandwidth for D2D communication. In this case, the D2D communication UE detects a specific frequency band signal using a low pass filter, such that the remaining band signals other than a D2D communication band may be filtered so that interference may be removed. Alternatively, the D2D communication UE attempts to perform subsampling in a time domain such that a D2D signal transmitted within a small-range system bandwidth can be obtained.
As one example of a method for establishing different frequency bands distinguished from D2D communication, signals can be transmitted and received for D2D communication according to a system parameter defined in response to a D2D system bandwidth.
Referring to
The processor 913 of the transmission point apparatus 910 according to one embodiment of the present invention can process items requisite for D2D communication.
The processor 913 of the transmission point apparatus 910 processes information received at the transmission point apparatus 910 and transmission information to be transmitted externally. The memory 914 may store the processed information for a predetermined time. The memory 914 may be replaced with a component such as a buffer (not shown).
Referring to
The processor 923 of the UE apparatus 920 according to one embodiment of the present invention can process items requisite for D2D communication.
The processor 923 of the UE apparatus 920 processes information received at the UE apparatus 920 and transmission information to be transmitted externally. The memory 924 may store the processed information for a predetermined time. The memory 924 may be replaced with a component such as a buffer (not shown).
The specific configurations of the transmission point apparatus and the UE apparatus may be implemented such that the various embodiments of the present invention are performed independently or two or more embodiments of the present invention are performed simultaneously. Redundant matters will not be described herein for clarity.
The description of the transmission point apparatus 910 shown in
The above-described embodiments of the present invention can be implemented by a variety of means, for example, hardware, firmware, software, or a combination thereof
In the case of implementing the present invention by hardware, the present invention can be implemented with application specific integrated circuits (ASICs), Digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), a processor, a controller, a microcontroller, a microprocessor, etc.
If operations or functions of the present invention are implemented by firmware or software, the present invention can be implemented in the form of a variety of formats, for example, modules, procedures, functions, etc. The software codes may be stored in a memory so that it can be driven by a processor. The memory is located inside or outside of the processor, so that it can communicate with the aforementioned processor via a variety of well-known parts.
The detailed description of the exemplary embodiments of the present invention has been given to enable those skilled in the art to implement and practice the invention. Although the invention has been described with reference to the exemplary embodiments, those skilled in the art will appreciate that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention described in the appended claims. For example, those skilled in the art may use each construction described in the above embodiments in combination with each other. Accordingly, the invention should not be limited to the specific embodiments described herein, but should be accorded the broadest scope consistent with the principles and novel features disclosed herein.
Those skilled in the art will appreciate that the present invention may be carried out in other specific ways than those set forth herein without departing from the spirit and essential characteristics of the present invention. The above exemplary embodiments are therefore to be construed in all aspects as illustrative and not restrictive. The scope of the invention should be determined by the appended claims and their legal equivalents, not by the above description, and all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein. Also, it will be obvious to those skilled in the art that claims that are not explicitly cited in the appended claims may be presented in combination as an exemplary embodiment of the present invention or included as a new claim by subsequent amendment after the application is filed.
INDUSTRIAL APPLICABILITYThe embodiments of the present invention can be applied to a variety of mobile communication systems.
Claims
1. A method for transmitting a signal by a device-to-device (D2D) user equipment (UE) configured to perform D2D communication in a wireless communication system, the method comprising:
- transmitting a signal after application of a first timing advance (TA) value for D2D communication,
- wherein the first timing advance (TA) value for the D2D communication is associated with a second timing advance (TA) value applied when the UE transmits an uplink signal to a base station (BS).
2. The method according to claim 1, wherein the timing advance (TA) value for D2D communication is identical to the second timing advance (TA) value.
3. The method according to claim 1, wherein the timing advance (TA) value for D2D communication is achieved by adding a predetermined value to the second timing advance (TA) value.
4. The method according to claim 3, wherein the predetermined value is either an integer multiple of a cyclic prefix (CP) or a value indicated by the BS.
5. The method according to claim 1, wherein the timing advance (TA) value for D2D communication is the highest one from among values that are BS-established as the second timing advance (TA) value.
6. The method according to claim 1, wherein the second timing advance (TA) value is received as a MAC control element.
7. The method according to claim 1, wherein:
- a frequency band used when the first timing advance (TA) value is applied to signal transmission is smaller than a frequency band used when the second timing advance (TA) value is applied to signal transmission.
8. A user equipment (UE) apparatus configured to perform D2D communication in a wireless communication system, the UE apparatus comprising:
- a transmission module; and
- a processor,
- wherein the processor transmits a signal after application of a first timing advance (TA) value for D2D communication, and the first timing advance (TA) value for the D2D communication is associated with a second timing advance (TA) value applied when the UE transmits an uplink signal to a base station (BS).
9. The UE apparatus according to claim 8, wherein the timing advance (TA) value for D2D communication is identical to the second timing advance (TA) value.
10. The UE apparatus according to claim 8, wherein the timing advance (TA) value for D2D communication is achieved by adding a predetermined value to the second timing advance (TA) value.
11. The UE apparatus according to claim 10, wherein the predetermined value is either an integer multiple of a cyclic prefix (CP) or a value indicated by the BS.
12. The UE apparatus according to claim 8, wherein the timing advance (TA) value for D2D communication is the highest one from among values that are BS-established as the second timing advance (TA) value.
13. The UE apparatus according to claim 8, wherein the second timing advance (TA) value is received as a MAC control element.
14. The UE apparatus according to claim 8, further comprising:
- a frequency band used when the first timing advance (TA) value is applied to signal transmission is smaller than a frequency band used when the second timing advance (TA) value is applied to signal transmission.
Type: Application
Filed: Feb 18, 2013
Publication Date: Feb 5, 2015
Applicant: LG ELECTRONICS INC. (Seoul)
Inventors: Hyunsoo Ko (Anyang-si), Jiwoong Jang (Anyang-si), Jaehoon Chung (Anyang-si)
Application Number: 14/374,871
International Classification: H04L 5/14 (20060101); H04L 5/00 (20060101);