Sounding Reference Signal Transmission in a Wireless Network

• US 20170026920A1
• Filed: 07/04/2016
• Published: 01/26/2017
• Est. Priority Date: 01/25/2012
• Status: Active Grant

• Current Assignee: Comcast Cable Communications LLC (Comcast Corporation)
• Original Assignee: Comcast Cable Communications LLC (Comcast Corporation)
• Inventors: Dinan, Esmael Hejazi
• Granted Patent: US 10,039,131 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04J 2011/0096 Network synchronisation
• CPC Class Codes: H04L 27/2692 with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
• CPC Class Codes: H04L 27/32 Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04L 65/1066 Session management
• CPC Class Codes: H04W 28/00 Network traffic management; Network resource management
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 36/0072 of resource information of target access point
• CPC Class Codes: H04W 48/00 Access restriction access security to prevent unauthorised access H04W12/08; Network selection; Access point selection
• CPC Class Codes: H04W 48/20 Selecting an access point
• CPC Class Codes: H04W 52/14 Separate analysis of uplink or downlink
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/18 TPC being performed according to specific parameters
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/248 where transmission power control commands are generated based on a path parameter
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 56/0005 : synchronizing of arrival of multiple uplinks
• CPC Class Codes: H04W 56/001 : Synchronization between nodes
• CPC Class Codes: H04W 56/0045 : compensating for timing error by altering transmission time
• CPC Class Codes: H04W 72/0446 : Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/20 : Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/002 : Transmission of channel access control information
• CPC Class Codes: H04W 74/006 : in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/0833 : Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 76/15 : Setup of multiple wireless link connections
• CPC Class Codes: H04W 76/18 : Management of setup rejection or failure
• CPC Class Codes: H04W 76/27 : Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 88/02 : Terminal devices
• CPC Class Codes: H04W 88/08 : Access point devices

Abstract

A wireless device receives message(s) comprising configuration parameters of sounding reference signals on a secondary cell in a secondary cell group. The wireless device transmits one or more of the sounding reference signals on the secondary cell after applying a timing advance to the secondary cell group. The wireless device is configured to not transmit any of the sounding reference signals on the secondary cell after receiving the message(s) and before receiving the timing advance.

Claims

1. A wireless device comprising:

one or more processors; and

memory storing instructions that, when executed, cause the wireless device to;

receive at least one message comprising;

a cell group index of a secondary cell of a secondary cell group in a plurality of cell groups; and

configuration parameters of sounding reference signals (SRSs) transmission on the secondary cell;

receive a control command to cause transmission of a random access preamble in the secondary cell group;

receive a random access response comprising a timing advance command (TAC) for the secondary cell group and a power control command; and

transmit a plurality of the SRSs on the secondary cell in response to applying the TAC, wherein transmission power of the first occurrence of the plurality of the SRSs depends, at least in part, on the power control command, and wherein the wireless device is configured to not transmit any of the SRSs on the secondary cell during a period between receiving the at least one message and receiving the TAC.

2. The wireless device of claim 1, wherein the instructions further cause the wireless device to receive an activation command after receiving the at least one message and before receiving the control command.

3. The wireless device of claim 1, wherein the wireless device drops at least one SRS if one or more pre-defined conditions are met.

4. The wireless device of claim 1, wherein the at least one message further causes configuration of random access resources used for transmission of the random access preamble.

5. The wireless device of claim 1, wherein the instructions further cause the wireless device to drop transmission of an SRS in the SRSs in a subframe of the secondary cell when the wireless device is power limited.

6. The wireless device of claim 1, wherein applying the timing advance command causes alignment of reception timing of uplink signals in frames and subframes of the secondary cell group at the base station.

7. The wireless device of claim 1, wherein the at least one message is configured to further cause in the wireless device configuration of a time alignment timer for each of the plurality of cell groups, the time alignment timer starting or restarting in response to the wireless device receiving a first timing advance command to adjust uplink transmission timing of a commanded cell group in the plurality of cell groups.

8. The wireless device of claim 1, wherein the random access response comprises a preamble identifier identifying the random access preamble.

9. The wireless device of claim 1, wherein the plurality of cell groups comprises a first cell group and a second cell group, wherein:

uplink transmission timing in the first cell group is derived employing a first cell in the first cell group; and

uplink transmission timing in the second cell group is derived employing a second cell in the second cell group.

10. The wireless device of claim 1, wherein the instructions further cause the wireless device to:

transmit a first SRS in the SRSs in a first subframe of the secondary cell when the wireless device has sufficient power to transmit one or more first data packets in parallel with the first SRS; and

drop a configured transmission of a second SRS in the SRSs in a second subframe of the secondary cell if the wireless device does not have sufficient power to transmit one or more second data packets in parallel with the second SRS.

11. A method comprising:

receiving, by a wireless device, at least one message comprising;

a cell group index of a secondary cell of a secondary cell group in a plurality of cell groups; and

configuration parameters of sounding reference signals (SRSs) transmission on the secondary cell;

receiving a control command to cause transmission of a random access preamble in the secondary cell group;

receiving a random access response comprising a timing advance command (TAC) for the secondary cell group and a power control command; and

transmitting a plurality of the SRSs on the secondary cell in response to applying the TAC, wherein transmission power of the first occurrence of the plurality of the SRSs depends, at least in part, on the power control command, and wherein the wireless device is configured to not transmit any of the SRSs on the secondary cell during a period between receiving the at least one message and receiving the timing advance command.

12. The method of claim 11, further comprising receiving an activation command after receiving the at least one message and before receiving the control command.

13. The method of claim 11, further comprising dropping at least one SRS if one or more pre-defined conditions are met.

14. The method of claim 11, wherein the at least one message further causes configuration of random access resources used for transmission of the random access preamble.

15. The method of claim 11, further comprising dropping transmission of an SRS in the SRSs in a subframe of the secondary cell when the wireless device is power limited.

16. The method of claim 11, wherein applying the timing advance command causes alignment of reception timing of uplink signals in frames and subframes of the secondary cell group at the base station.

17. The method of claim 11, wherein the at least one message is configured to further cause in the wireless device configuration of a time alignment timer for each of the plurality of cell groups, the time alignment timer starting or restarting in response to the wireless device receiving a first timing advance command to adjust uplink transmission timing of a commanded cell group in the plurality of cell groups.

18. The method of claim 11, wherein the random access response comprises a preamble identifier identifying the random access preamble.

19. The method of claim 11, wherein the plurality of cell groups comprises a first cell group and a second cell group, wherein:

uplink transmission timing in the first cell group is derived employing a first cell in the first cell group; and

uplink transmission timing in the second cell group is derived employing a second cell in the second cell group.

20. The method of claim 11, further comprising:

transmitting a first SRS in the SRSs in a first subframe of the secondary cell when the wireless device has sufficient power to transmit one or more first data packets in parallel with the first SRS; and

dropping a configured transmission of a second SRS in the SRSs in a second subframe of the secondary cell if the wireless device does not have sufficient power to transmit one or more second data packets in parallel with the second SRS.