Managing transmission power for hybrid-ARQ groups
First Claim
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1. A method comprising:
- in a cellular radio access network (RAN) that serves a plurality of wireless communication devices (WCDs), grouping the WCDs into respective Hybrid-ARQ (HARQ) groups based on channel quality reported respectively by the WCDs for downlink communication from the RAN to the WCDs, wherein grouping the WCDs into the respective HARQ groups based on channel quality reported respectively by the WCDs for downlink communication from the RAN to the WCDs comprises (a) assigning the first group of WCDs to the first HARQ group in response to the first group of WCDs having reported channel quality similar to each other, and (b) assigning the second group of WCDs to the second HARQ group in response to the second group of WCDs having reported channel quality similar to each other;
differentially allocating HARQ transmission power to the respective HARQ groups based on the channel quality reported by the WCDs of each group; and
transmitting HARQ messaging to each HARQ group of WCDs using the differential allocation of transmission power,whereby transmission power for HARQ messaging to a first one of the HARQ groups differs from transmission power for HARQ messaging to a second one of the HARQ groups.
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Abstract
A base station that serves a plurality of wireless communication devices (WCDs) will group the WCDs into physical hybrid automatic repeat request (HARQ) channel (PHICH) groups based on channel quality reported by the WCDs and will then differentially allocate transmission power among the PHICH groups, so as to provide higher transmission power for transmission to PHICH groups of WCDs that reported lower channel quality, while providing lower transmission power for transmission to PHICH groups of WCDs that reported higher channel quality.
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Citations
18 Claims
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1. A method comprising:
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in a cellular radio access network (RAN) that serves a plurality of wireless communication devices (WCDs), grouping the WCDs into respective Hybrid-ARQ (HARQ) groups based on channel quality reported respectively by the WCDs for downlink communication from the RAN to the WCDs, wherein grouping the WCDs into the respective HARQ groups based on channel quality reported respectively by the WCDs for downlink communication from the RAN to the WCDs comprises (a) assigning the first group of WCDs to the first HARQ group in response to the first group of WCDs having reported channel quality similar to each other, and (b) assigning the second group of WCDs to the second HARQ group in response to the second group of WCDs having reported channel quality similar to each other; differentially allocating HARQ transmission power to the respective HARQ groups based on the channel quality reported by the WCDs of each group; and transmitting HARQ messaging to each HARQ group of WCDs using the differential allocation of transmission power, whereby transmission power for HARQ messaging to a first one of the HARQ groups differs from transmission power for HARQ messaging to a second one of the HARQ groups. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An eNodeB comprising:
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an antenna structure for wirelessly communicating with user equipment devices (UEs) served by the eNodeB over an orthogonal frequency division multiple access (OFDMA) air interface defining a continuum of subframes each spanning a plurality of resource elements across a frequency bandwidth; a power amplifier arranged to control power of transmission within the resource elements; and a controller arranged (i) to group the served UEs into Physical Hybrid ARQ Indicator Channel (PHICH) groups based on downlink channel quality reported by the UEs, wherein the eNodeB transmits HARQ messaging respectively to each PHICH group of UEs in a respective mutually exclusive group of the resource elements, and (ii) to cause the power amplifier to differentially allocate transmission power to resource elements used for transmission of HARQ messaging to the PHICH groups of UEs, the differential allocation being based on the downlink channel quality reported by the UEs of the respective PHICH groups, wherein grouping the served UEs into PHICH groups based on downlink channel quality comprises (a) assigning a first group of the UEs to a first PHICH group in response to the UEs of the first group having reported downlink channel quality similar to each other and (b) assigning a second group UEs to a second PHICH group in response to the UEs of the second group having reported downlink channel quality similar to each other. - View Dependent Claims (10, 11, 12, 13)
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14. A method comprising:
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serving, by a radio access network (RAN), a plurality of wireless communication devices (WCDs) over an air interface between the RAN and the WCDs; while serving the plurality of WCDs, receiving channel quality reports into the RAN from the WCDs, including receiving from each WCD a respective channel quality report indicating downlink channel quality between the RAN and the WCD; grouping the WCDs, by the RAN, into mutually exclusive Hybrid-ARQ (HARQ) groups based on the channel quality reports received from the WCDs, including grouping a first proper subset of the WCDs into a first HARQ group based on the first proper subset of the WCDs having reported relatively high channel quality and grouping a second proper subset of the WCDs into a second HARQ group based on the second proper subset of WCDs having reported relatively low channel quality; assigning the HARQ groups to mutually exclusive sets of downlink transmission resources for transmission of HARQ messaging to the WCDs of the HARQ groups, including assigning each HARQ group to a respective set of downlink transmission resources for transmission of HARQ messaging to the WCDs of the HARQ group; differentially allocating transmission power to the sets of downlink transmission resources based on the channel quality reported by the WCDs of the HARQ group assigned to each set of downlink transmission resources; and transmitting HARQ messaging to the WCDs using the assigned sets of downlink transmission resources with the differentially allocated transmission power. - View Dependent Claims (15, 16, 17, 18)
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Specification