| 摘要 |
A method for coordinated multipoint transmission includes collecting, in a serving CoMP-MA, channel state information, CSIs, reported by terminals served by eNBs within a cooperating set. The serving CoMP-MA selects dominant interferers as candidate transmitting eNBs for a terminal. CoMP joint transmission is initiated by forwarding, to the candidate transmitting eNBs, PDCP PDUs received from SGW and targeted to the selected terminal, and by setting the status of the terminal to joint transmission. High and low thresholds of PDCP buffers of the serving CoMP-MA are adjusted. As information required for air interface scheduling becomes available, the method includes extracting, in the serving CoMP-MA, radio resource allocations, RLC and MAC headers, references to user plane data, and precoding matrices from protocol entities, and forwarding them to the transmitting eNBs that have acknowledged PDCP PDUs, in order the transmitting CoMP-MA to prepare air interface for the terminal. |
| 主权项 |
1. A method for coordinated multipoint transmission in a communications system, characterized by
collecting, in a serving CoMP-MA, channel state information, CSIs, periodically reported by user terminals served by a base station within a cooperating set, and forwarding the CSIs periodically reported by the user terminals served by said base station to other base stations within the cooperating set; based on the collected CSIs, identifying and selecting, in the serving CoMP-MA, one or more dominant interferers as potential candidates for transmitting network nodes for a selected user terminal; initiating CoMP joint transmission by forwarding, to the candidates for the transmitting network node for the selected user terminal, PDCP PDUs received from a serving gateway and targeted to the selected user terminal and setting the status of the selected user terminal to joint transmission; receiving an acknowledgement on PDCP PDUs received in a candidate for the transmitting network node, in case the candidate transmitting network node is capable of handling the joint transmission to the user terminal; measuring, in the serving CoMP-MA, time spent between forwarding PDCP PDU and receiving a corresponding acknowledgement; adjusting, based on the measurement, a high threshold and a low threshold of predefined PDCP buffers of the serving CoMP-MA; in response radio information required for air interface scheduling becoming available, extracting, in the serving CoMP-MA, radio resource allocations, RLC and MAC headers, references to user plane data included, and precoding matrices from corresponding protocol entities, forwarding the extracted radio resource allocations, RLC and MAC headers, references to the user plane data included, and precoding matrices to the transmitting network nodes that have acknowledged PDCP PDUs, in order the transmitting CoMP-MA to be able to prepare for air interface scheduling for the user terminal. |
