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Radio resource allocation in a narrowband communication system

專利號
US10791555B2
公開日期
2020-09-29
申請人
Telefonaktiebolaget LM Ericsson (publ)（SE Stockholm）
發(fā)明人
Vidit Saxena; Johan Bergman; Yufei Blankenship; Xingqin Lin
IPC分類
H04W72/04; H04L5/00; H04W76/27
技術(shù)領(lǐng)域
resource,pusch,allocation,uplink,nb,radio,in,tone,circuitry,khz
地域： Stockholm

摘要

Methods and apparatuses of resource allocation for wireless communication are presented. In an example, a user equipment (12) may contain radio circuitry and processing circuitry such that the user equipment (12) is configured to obtain a set of multiple indices, where each index in the set of multiple indices corresponds to a different uplink resource allocation from a set of uplink resource allocations (11) formed from twelve contiguous subcarriers. In an aspect, the set of uplink resource allocations (11) includes an allocation of the twelve contiguous subcarriers, two allocations of six contiguous subcarriers, four allocations of three contiguous subcarriers, and twelve allocations of a single subcarrier. In a further aspect, the user equipment (12) can receive an index indication corresponding to an index from the set of multiple indices from the base station (10). Also, the user equipment (12) can transmit data to the base station (10) using the resource allocation corresponding to the received index indication.

說明書

However in case of NB-IOT, it is currently possible to schedule NB-PUSCH resource with a 1-subcarrier granularity, as illustrated in FIG. 12.

This implies that the base sequences used for DMRS must have good cross-correlation properties with an offset of 0, 1, 2, . . . , 6 subcarriers. Low correlation for all possible offsets is difficult to achieve in practice, especially for a sufficiently large number of length-6 and length-3 sequences. On the other hand, using base sequences with poor cross-correlation properties will lead to inter-cell interference.

FIG. 12 shows an example NB-PUSCH allocation within a subframe, for multi-tone transmission formats. The offset between NB-PUSCH allocations, and subsequently between the UL DMRS, can be on 1-subcarrier granularity. Additionally, the different NB-PUSCH transmission formats lead to a large number of possible resource allocations. In the most general case, the DCI for scheduling NB-PUSCH can:

    • Distinguish between 15 kHz and 3.75 kHz numerologies (1 bit) (if this is not signaled in other places such as SIBx.)
    • In case of 15 kHz, the number of possible NB-PUSCH allocations for 1, 3, 6, and 12-tone formats are 12, 10, 7, and 1 respectively (30 cases requiring 5 bits)
    • In case of 3.75 kHz, specify one of 48 subcarriers (requiring 6 bits)

權(quán)利要求

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