Patent ID: 8730922
Filing Date: 2014-05-20
Classification: H04B

Abstract:
1. A method for uplink transmit diversity in a user equipment of a High-Speed Packet Access (HSPA) communications system, the method comprising: performing uplink transmission using a first set of pre-coding weights; selecting an updated set of pre-coding weights for continuing the uplink transmission, wherein the selection of the updated set of pre-coding weights includes: detecting if the user equipment is currently in one of a predetermined set of situations including one or a combination of the following: if the user equipment is detected to be in one of the predetermined set of situations, applying a set of restrictions associated with the detected situation when selecting the updated set of pre-coding weights, wherein the set of restrictions limits an amount of change between pre-coding weights of the updated set of pre-coding weights and previous pre-coding weights applied for the uplink transmission; and performing uplink transmission using the selected updated set of pre-coding weights, wherein the set of restrictions specifies a maximum relative pre-coding weight phase change during a time interval, and wherein the user equipment applies switched antenna diversity for the uplink transmission and the set of restrictions specifies that the user equipment is restricted from switching antenna for the uplink transmission.