Hong Kong Applied Science and Technology Research Institute Company, Limited

Yun Hou

Eddy Chiu

Man Wai Kwan

Xiangyu Liu

Kong Chau Eric Tsang

Yuyi Mao

Kong Chau Tsang

Yaming Luo

Man Wai Victor Kwan

Ching Hong Chris Leung

Described is a method of decoding a physical sidelink control channel (PSCCH). The method comprises: for a PSCCH candidate in a resource grid, processing a received demodulation reference signal (DMRS) in a subframe of the resource grid associated with the PSCCH candidate to determine one or more potential PSCCHs for decoding, each of the one or more potential PSCCHs being identified by resource block (RB) position in the resource grid and a corresponding DMRS cyclic shift (n) value. This step is repeated for at least one other DMRS in the subframe to determine one or more potential PSCCHs for the at least one other DMRS. Then, a subset L of PSCCHs is selected from the potential PSCCHs. The selected subset L of PSCCHs together with their corresponding DMRS cyclic shift (n) values are made available for use in a decoding process for the received channel signal.

Method of processing a received channel signal in a device to device communications link using multiple reference signals

Described is a method of decoding a physical sidelink shared channel (PSSCH) involving physical sidelink control channel (PSCCH) resource grid search space reduction, timing offset (TO) estimation, and reference symbol identification. Resource grid search space reduction may include identifying resource blocks (RBs) having a signal power below a first threshold such that said RBs can be excluded from further processing. Search space reduction may additionally or alternatively include identifying RB pairs where a difference in signal power between the RBs comprising each pair of RBs is above a second threshold and excluding any such said RB pairs from further processing. TO compensation may include circularly correlating TO-compensated received DMRSs and their corresponding local DMRSs to obtain energy or power profiles. From the energy/power profiles, a subset L of highest stored power values and their corresponding cyclic shift (n) values can be chosen where said power values are equal to or exceed a third threshold. The selected subset L can be made available for use in a decoding process for a received channel signal.

Method of processing a received channel signal in a device to device communications link

For an ultra dense network (UDN) having small cells of highly overlapped coverages, a user equipment (UE) selects in a handover process a preferred base station (BS) from candidate BSs for minimizing occurrence of handover events. The UE computes finite differences consisting of a first-, a second-, and one or more higher-order differences, according to received signal strength (RSS) values obtained for each candidate BS. A preference level, which is a total number of finite differences having consecutive order numbers, including the first-order difference, and being positive or non-negative, is computed for each candidate BS. One or more favorable candidate BSs from the candidate BSs are identified such that the group of such favorable candidate BSs has the same preference level that is maximum among all the preference levels computed for the candidate BSs. The preferred BS is selected from the group of such favorable candidate BSs.

Base station selection in ultra dense network handover scenarios

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Hong Kong, China

Yun Hou