US 9,319,111 B2 · Code allocation for uplink MIMO

Abstract

The disclosure relates to methods and apparatuses that allow for channelization code allocation adapted for uplink MIMO transmissions. A method for use in a user equipment of a telecommunication system comprises spreading data symbols of a plurality of streams to be transmitted from the user equipment as MIMO transmissions. The step of spreading the data symbols comprises allocating, for each stream, at least one channelization code (62) to be applied for spreading the data symbols of the stream. The plurality of streams are allocated channelization codes (62) from a predefined code tree (61) of applicable channelization codes such that any channelization code (62) is allocated to more than one stream only if there is no applicable channelization code left in the code tree (61) which currently is not allocated for any stream. The channelization code allocation scheme makes it possible to avoid inter-stream interference in many scenarios of uplink MIMO transmissions.

Claims18

Dependent claims

A method implemented by a user equipment for spreading data symbols of a plurality of streams to be transmitted from the user equipment as uplink Multiple-Input Multiple-Output, MIMO, transmissions in a telecommunication system, the method comprising:

allocating at least one channelisation code from a predefined code tree of applicable channelisation codes to each stream, and reallocating one or more channelisation codes to any remaining streams in the plurality of streams only if all channelisation codes have already been allocated, wherein the one or more channelisation codes reallocated to any remaining streams is selected from applicable codes previously allocated to a least number of streams;
and
spreading the data symbols of each stream of the plurality of streams using the at least one channelisation code respectively allocated to that stream, wherein the plurality of streams are transmitted from the user equipment, each on a different antenna, as uplink MIMO transmissions.

A user equipment configured to spread data symbols of a plurality of streams to be transmitted from the user equipment as uplink Multiple-Input Multiple-Output, MIMO, transmissions in a telecommunication system, wherein the user equipment comprises a processor configured to:

allocate at least one channelisation code from a predefined code tree of applicable channelisation codes to each stream, and reallocate one or more channelisation codes to any remaining streams in the plurality of streams only if all channelisation codes have already been allocated, wherein the one or more channelisation codes reallocated to any remaining streams is selected from applicable codes previously allocated to a least number of streams;
and
spread the data symbols of each stream of the plurality of streams using the at least one channelisation code respectively allocated to that stream, wherein the plurality of streams are transmitted from the user equipment, each on a different antenna, as uplink MIMO transmissions.

Dependencies are inferred from the claim text.

Code allocation for uplink MIMO

Life of this patent

Code allocation for uplink MIMO

Life of this patent

Abstract

Claims18