Abstract: Techniques for controlling the operation of user equipments (UEs) to mitigate emissions out of band are described. A base station may identify a UE potentially causing excessive emissions out of band due to transmission of control information and may schedule the UE to reduce the emissions out of band. In one design, the base station may schedule the UE to send control information on a Physical Uplink Shared Channel (PUSCH) instead of a Physical Uplink Control Channel (PUCCH). In another design, the base station may assign the UE with resources for the PUCCH to send control information. The assigned resources may be selected to mitigate the emissions out of band and may be (i) located within a target frequency range, (ii) located away from a frequency band to be mitigated with the emissions out of band, or (iii) obtained with a reuse scheme and have less inter-cell interference from other UEs.

Abstract: Systems and methodologies are described that facilitate security activation within a specified security activation time. Thus, where handover occurs or is initiated within the activation time, security keys can be activated in such a way as to not be substantially affected by the handover. In one example, a handover time can be set to occur beyond the security activation time to ensure the security activation happens first. Additionally, a handover command can comprise security keys that can be activated upon handover in another example. Moreover, in non-real-time contexts, dummy packets can be transmitted to allow timer operability with packet sequence numbering, or security activation times can be substantially ignored by utilizing a verification process.

Abstract: Techniques for transmitting acknowledgement (ACK) information in a wireless communication system are described. The system supports data transmission to multiple user equipments (UEs) on the same downlink resources with spatial division multiple access (SDMA). A base station sends a data transmission with multiple (M) layers to M UEs. The downlink resources used for the data transmission are associated with ACK resources used to send ACK information for the data transmission. The ACK resources may be partitioned into M portions, e.g., based on frequency division multiplexing (FDM). Each of the M layers is associated with a respective portion of the ACK resources. A recipient UE for each layer sends ACK for that layer on the associated portion of the ACK resources. For each ACK resource portion, one or more pilot symbols may be sent on one or more resource elements, and ACK symbols may be sent on remaining resource elements.

Abstract: Systems and methodologies are described that facilitate adaptive uplink pilot multiplexing schemes. In various embodiments, frequency position and pilot channel bandwidth can be adaptively varied in a block over time based on the uplink channel data, such as the number of streams to be multiplexed. Thus, the provided adaptive uplink pilot multiplexing schemes provide flexible uplink pilot allocation schemes while maintaining single carrier waveform for improved transmit power efficiency and orthogonality of pilots within blocks for improve channel estimation and suppression of interference.

Abstract: Techniques for generating reference signals in a wireless communication system are described. A set of Q reference signal sequences may be generated based on G pseudo-random sequences and L scrambling sequences, where Q=G·L, G>1 and L>1. The Q reference signal sequences may be used for Q cell identities (IDs), one reference signal sequence for each cell ID. In one design, a Node B may determine first and second indices based on a cell ID of a cell. The Node B may generate a pseudo-random sequence based on the first index, generate a scrambling sequence based on the second index, and generate a reference signal sequence based on the pseudo-random sequence and the scrambling sequence. The Node B may then generate a reference signal for the cell based on the reference signal sequence, e.g., by generating an OFDM symbol with the reference signal sequence mapped to a set of subcarriers.

Abstract: A system and method for inter-cell power control for interference management in an OFDM system is provided. The system provides for a combination use of open loop and closed loop PSD control algorithms. The open loop control is a function of path loss from the serving cell as well as the neighboring cells. The closed loop control updates the end node transmit PSD by listening to the load indicators from the serving cell and at least one other neighboring non-serving cell which generates the highest level of interference. The system thus provides a fast and tight control with multi-cell information that allows improved inter-cell interference control.

Abstract: Systems and methodologies are described that facilitate employing constrained frequency hopping of downlink reference signals. Constrained frequency hopping of reference signals provides a sufficiently large set of frequency hopping patterns while enhancing channel estimation. Respective subsets of resource elements can be selected to carry reference signals from a plurality of antennas for a first subframe of a sequence. Further, respective subsets of resource elements used to carry reference signals from the plurality of antennas for a second subframe can be constrained based upon the respective subsets for the first subframe. Moreover, the first subframe frame and the second subframe (and similarly any additional subframes in the sequence) can be transmitted. An access terminal receiving the sequence of subframes can combine reference signals sent from common antennas at common frequency locations in the plurality of subframes and perform channel estimation as a function of the combined reference signals.

Abstract: Methods and apparatus are disclosed for generating and exchanging codebooks in a multiple access wireless communication system. The codebooks include a plurality of preferred precoding matrices.