Code Assignment in HS-SCCH Less Operation Mode

• US 20110110245A1
• Filed: 08/23/2007
• Published: 05/12/2011
• Est. Priority Date: 08/23/2007
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Hannu, Hans, Ericson, Marten, Synnergren, Per
• Granted Patent: US 8,582,451 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04J 13/0077 Multicode, e.g. multiple codes assigned to one user
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04W 72/0466 the resource being a scrambling code
• CPC Class Codes: H04W 72/52 based on load

Abstract

In a method and a system a good spread of users per code is obtained by providing a value related to the current load for each code in the system. The estimated load value can be used by the network to assign the HS-PDSCH code for users in HS-SCCH less operation, and may also be used in the dynamic transmission process, i.e. which codes are to be used by which user during this and future TTIs. If one code is over a given utilization threshold, where the threshold is set in order to avoid code blocking of VoIP users, enough users can be re-assigned to a different code. In the case that all of the current codes used in the HS-SCCH less operation model are over the utilization threshold, yet another code can be made available for HS-SCCH less operation.

Claims

1-16. -16. (canceled)

17. A method of assigning codes for users in a cellular radio system operating in a High Speed Shared Control Channel (HS-SCCH) less mode of operation, the method comprising:

determining the system load generated by a user communicating with the system in a HS-SCCH less operation mode; and

assigning a code for the user in response to said determined system load.

18. The method of claim 17, wherein assigning a code for the user comprises assigning a High Speed Physical Downlink Shared Channel (HS-PDSCH) code.

19. The method of claim 17, wherein determining the system load generated by a user comprises determining the system load based on one or many of the following parameters:

MAC-hs buffer level;

packet arrival time;

number of re-transmissions;

transmit power usage; and

interference level.

20. The method claim 17, further comprising:

determining if one used code is above a predetermined utilization threshold value.

21. The method of claim 20, wherein, if said one used code is determined to be above the predetermined utilization threshold value, one or more users assigned to that code is reassigned to another code.

22. The method of claim 20, further comprising:

making another code available if all used codes exceed their respective predetermined utilization threshold values.

23. The method of claim 17, further comprising:

continuously or periodically determining the load caused by all users of a particular code and comparing said combined load to a pre-determined utilization threshold value.

24. The method of claim 23, wherein, if a used code is determined to be above a predetermined utilization threshold value, one or more users assigned to that code is reassigned to another code.

25. A node of a cellular radio system operating in a High Speed Shared Control Channel (HS-SCCH) less mode of operation, the node adapted to assign codes for users and comprising:

a load determination circuit configured to determine the system load generated by a user communicating with the system in a HS-SCCH less operation mode, and

a code assignment circuit configured to assign a code for the user in response to said determined system load.

26. The node of claim 25, wherein the code assignment circuit is configured to assign a High Speed Physical Downlink Shared Channel (HS-PDSCH) code.

27. The node of claim 25, wherein the load determination circuit is configured to determine the system load based on one or many of the following parameters:

MAC-hs buffer level;

packet arrival time;

number of re-transmissions;

transmit power usage; and

interference level.

28. The node of claim 25, wherein the load determination circuit is further configured to determine if one used code is above a predetermined utilization threshold value.

29. The node of claim 28, wherein the code assignment circuit is configured to re-assign one or more users assigned to said one used code to another code, if said one used code is determined to be above the predetermined utilization threshold value.

30. The node of claim 28, wherein the code assignment circuit is configured to make another code available if all used codes exceed their respective predetermined utilization threshold values.

31. The node of claim 25, wherein the load determination circuit is configured to continuously or periodically determine the load caused by all users of a particular code and compare said combined load to a pre-determined threshold value.

32. The node of claim 31, wherein the code assignment circuit is configured to re-assign one or more users assigned to a code to another code, if that code is determined to be above a pre-determined utilization threshold value.