The uplink PRBs allocated by the eNodeB to a single UE must be contiguous, uplink PRB resources cannot be fully utilized because there remain multiple non-contiguous PRB segments that cannot be allocated to the same UE in the event of multi-UE scheduling or RB blocking.
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UL Multi-Cluster (Huawei) or Uplink Resource allocation type 1 (3GPP) was introduced to 3GPP TS 36.213 in Release 10, when using this feature the eNB can allocate a maximum of two non-contiguous PRB clusters to a single UE.
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In the specifications there are two types of resource allocation:
- Uplink Resource allocation type 0
- Uplink Resource allocation type 1
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In Uplink Resource allocation type 0: The resource allocation information for uplink resource allocation type 0 indicates to a scheduled UE a set of contiguously allocated virtual resource block indices denoted by VRB.
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In Uplink Resource allocation type 1: The resource allocation information for uplink resource allocation type 1 indicates to a scheduled UE two sets of resource blocks with each set including one or more consecutive resource block groups of size P.
- P is the RBG (Resource Block Group) size, and can be 1, 2, 3, 4.
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With this function, the uplink scheduler can allocate a maximum of two non-contiguous PRB clusters to a single UE.
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Each cluster consists of an integer multiple of RBGs that are contiguous.
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The figure illustrates the principles for UL Multi-Cluster or Uplink Resource allocation type 1.
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To activate the feature in Huawei: enabled the UlMultiClusterSwitch option of the CellAlgoSwitch.UlSchExtSwitch
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Practically this feature increased Uplink data volume by 6% and PRB Utilization by 3% after applying it across a cluster of 4G sites.
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3GPP TS 36.213 Release 10
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