Network-centric link adaptation for coordinated multipoint downlink transmission
First Claim
1. A method of network-centric link adaptation for a first User Equipment (UE), performed by a controller of a first Coordinated Multi-Point (CoMP) cooperating set consisting of a single network transceiver that serves a plurality of UEs in a single cell, comprising:
- determining the downlink channel quality between the single network transmitter in the first CoMP cooperating set and the first UE;
determining the desired signal to be received at the first UE;
determining the interference caused to the first UE by transmissions to other UEs in the first CoMP cooperating set;
determining the thermal noise observed at the first UE; and
performing link adaptation for the first UE based on the downlink channel quality, the desired signal, the intra-CoMP cooperating set interference, and the thermal noise.
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Abstract
A Coordinated MultiPoint (CoMP) cell controller performs network-centric link adaptation for User Equipment (UE) in the CoMP cell. The CoMP cell controller receives at least infrequent channel estimates from a UE in the CoMP cell, from which it estimates downlink channel and thermal noise at the UE. The CoMP cell controller is aware of the desired signal to be received at the UE, and the intra-CoMP cell interference to the UE caused by transmissions to other UEs in the CoMP cell. The CoMP cell receives from the UE reports of inter-CoMP cell interference caused by transmissions by other CoMP cells. Based on the downlink channel quality, the desired signal, the intra-CoMP cell interference, the inter-CoMP cell interference, and the thermal noise, the CoMP cell controller performs link adaptation by selecting modulation and coding schemes, and other transmission parameters, for an upcoming transmission duration (such as a TTI).
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14 Claims
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1. A method of network-centric link adaptation for a first User Equipment (UE), performed by a controller of a first Coordinated Multi-Point (CoMP) cooperating set consisting of a single network transceiver that serves a plurality of UEs in a single cell, comprising:
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determining the downlink channel quality between the single network transmitter in the first CoMP cooperating set and the first UE; determining the desired signal to be received at the first UE; determining the interference caused to the first UE by transmissions to other UEs in the first CoMP cooperating set; determining the thermal noise observed at the first UE; and performing link adaptation for the first UE based on the downlink channel quality, the desired signal, the intra-CoMP cooperating set interference, and the thermal noise. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A Coordinated Multi-Point (CoMP) cell controller, comprising:
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a communication interface to a single network transceiver in a CoMP cooperating set, the single network transceiver providing wireless communications to a plurality of User Equipments (UE) within a single cell of the CoMP cooperating set; and a controller operative to communicate transmission parameters to the single network transceiver so as to maximize the data rate to selected UEs and while presenting interference to other UEs in the CoMP cooperating set below a predetermined amount, and further operative to perform link adaptation by determining the downlink channel quality between the one or more network transmitters in the first CoMP cooperating set and the first UE; determining the desired signal to be received at the first UE; determining the interference caused to the first UE by transmissions to other UEs in the first CoMP cooperating set; determining the thermal noise observed at the first UE; and performing link adaptation for the first UE based on the downlink channel quality, the desired signal, the intra-CoMP cooperating set interference, and the thermal noise. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification