GB2452288A - Timing of wireless transmissions using a common channel - Google Patents

Timing of wireless transmissions using a common channel Download PDF

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Publication number
GB2452288A
GB2452288A GB0716791A GB0716791A GB2452288A GB 2452288 A GB2452288 A GB 2452288A GB 0716791 A GB0716791 A GB 0716791A GB 0716791 A GB0716791 A GB 0716791A GB 2452288 A GB2452288 A GB 2452288A
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United Kingdom
Prior art keywords
timing
user equipment
commands
base station
shared channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0716791A
Other versions
GB0716791D0 (en
Inventor
Antti Toskala
Harri Holma
Karri Ranta-Aho
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Solutions and Networks Oy
Original Assignee
Nokia Siemens Networks Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Siemens Networks Oy filed Critical Nokia Siemens Networks Oy
Priority to GB0716791A priority Critical patent/GB2452288A/en
Publication of GB0716791D0 publication Critical patent/GB0716791D0/en
Publication of GB2452288A publication Critical patent/GB2452288A/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/002—Reducing depolarization effects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/286—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission during data packet transmission, e.g. high speed packet access [HSPA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The timing of the transmission from a user equipment is controlled on the basis of one or more timing commands received from a base station on a channel shared between the user equipment and one or more other user equipments and on which the user equipment also receives one or more transmission power control commands.

Description

CONTROL OF UPLINK TRANSMISSION TIMING
The present invention relates to a technique for controlling the timing of the uplink transmission of packet data in a WCDMA network in order to use a synchionised uplink for improved uplink capacity. In one embodiment, it relates to a technique for controlling uplink transmission timing in High-Speed Uplink Packet Access (HSUPA) whose specification is included in Universal Mobile Telecommunications System (UMTS) Releases 6 and 7 standards published by 3GPP.
HSUPA is a 3G mobile telephony protocol in the HSPA family, and involves the use of an enhanced dedicated channel (E-DCH) for uplink transmission of packet data.
It is proposed to reduce uplink intracell interference in such a high-speed packet data uplink by means of making a cell receive orthogonalised signals from user equipments (UEs). One technique of making the signals orthogonal is by sharing a common scrambling code and assigning different channelisation codes to the UEs. In order to preserve orthogonality at the receiving side (base station/Node B), the transmission time on the UE side needs to be adjusted so as to achieve the desired arrival times at the Node B. Time synchronisation is described in detail in 3GPP TR 25.854 V5.0.0 (2001-12) (whose entire content is incorporated herein by reference) in relation to lower speed access systems using a dedicated channel (DCH).
It is sit aim of the present invention to provide a technique for implementing such time synchronisation in the uplink transmission of packet data in a WCDMA network.
According to one aspect of the present invention, there is provided a method comprising: making a transmission from a user equipment; wherein the timing of the transmission is controlled on the basis of one or more timing commands received from a base station on a channel shared between the user equipment and one or more other user equipments and on which the user equipment also receives one or more transmission power control commands.
According to another aspect of the present invention, there is provided a method comprising: sending to a user equipment one or more timing commands for controlling the timing of a transmission from the user equipment, wherein the one or more timing commands are sent on a shared channel including one or more commands for one or more other user equipments, and also including one or more power control commands for said user equipment.
According to another aspect of the present invention, there is provided a device configured to control the timing of a transmission from a user equipment on the basis of one or more timing commands received at the user equipment on a channel shared between the user equipment and one or more other user equipments and which shared channel also includes one or more transmission power control commands for the user equipment.
According to another aspect of the present invention, there is provided a device which is configured to send to a user equipment one or more timing commands for controlling the timing of a transmission from the user equipment on a shared channel including one or more commands for one or more other user equipments, and also including one or more power control commands for said user equipment.
According to another aspect of the present invention, there is provided a method comprising: making a transmission from a user equipment; wherein the timing of the transmission is controlled on the basis of a plurality of timing control commands received from a base station.
According to another aspect of the present invention, there is provided a method comprising: receiving at a user equipment power control commands from a first base station and receiving at said user equipment timing commands from a second base station for controlling the timing of one or more transmissions from the user equipment; and ignoring any power control command that is received from the first base station at the same time as receiving a timing command from the second base station.
According to another aspect of the present invention, there is provided a device configured to control the timing of a transmission from a user equipment on the basis of a plurality of timing control commands received from a base station.
According to another aspect of the present invention, there is provided a device configured to receive power control commands from a first base station and receive timing commands from a second base station for controlling the timing of one or more transmissions from the device; and to ignore any power control command that is received from the first base station at the same time as receiving a timing command from the second base station.
Embodiments of the present invention will be described hereunder, by way of example only, with reference to the accompanying drawing which illustrates handover of a user equipment from one base station to another.
According to UMTS Release 6 and Release 7 HSUPA, packet data is transmitted from a user equipment (6, 8, 10, 12, 14) to the base station (2, 4) of its serving cell on an enhanced dedicated channel (E-DCH). The power at which the user equipment makes uplink transmissions is controlled according to a closed loop power control technique in which base stations monitor the power at which they receive transmissions from the user equipment and send transmission power control (TPC) -commands to the user equipment on a shared channel, F-DPCH (Fractional Dedicated Physical Channel). This physical layer channel carries sub-packets of turbo- encoded encoder packets from the base station, and is time-division multiplexed between a plurality of user equipments (UEs) in the same serving cell. Each of said plurality of user equipments gains access to the F-DPCH and receives TPC commands on this channel during time slots respectively allocated to it.
According to an embodiment of the present invention, timing control infonnation necessary for the time synchronisation mentioned above is provided to the user equipment on the F-DPCH. In more detail, part of the TPC commands for a user equipment included in the respective slots of the F-DPCH is replaced with said uplink transmission timing control information for said user equipment. For example, TPC command are periodically substituted with an uplink transmission timing control command (i.e. every Nth TPC command is substituted with an uplink transmission timing control command). The user equipment could combine multiple consecutive timing control commands for reliability. Even the use of as little as 2 to 5 bits for such timing control commands would allow the provision of "plus", "minus" or "stay" timing commands to a user equipment, which would improve reliability.
In Figure 1, user equipment 6 is moving from one cell to another cell. In the case of soft handover, the user equipment 6 is allocated slots from both the F-DPCH for the serving cell base station 2 and the F-DPCH for the non-serving cell base station 4.
According to one embodiment of the present invention, the F-DPCH for the serving cell base station 2 includes both power control information and uplink transmission timing control information for the user equipment 6, and the F-DPCH for the non-serving cell base station 4 includes only power control information for the user equipment 6.
In order to reduce the risk of confusion between power control commands from the non-serving cell base station 4 and timing control commands from the serving cell base station 4, a discontinuous transmission (DTX) technique could be used to stop the transmission of power control command bits from the non-serving cell base station 4 to the user equipment 6 on F-DPCH when timing control information is being sent to the user equipment 6 from the serving cell base station 2. Alternatively, the bits could be used for something else, such as overload control.
According to another variation, the user equipment 6 ignores TPC commands received from the non-serving cell base station 4 in time slots corresponding to those time slots in which the user equipment 6 is receiving timing control information from the serving cell base station 2.
In another embodiment, a downlink discontinuous reception (DRX) technique is employed in which the network limits the number of sub- frames where the user equipment has to monitor the F-DPCH in order to reduce UE battery consumption. A UE DRX cycle value is specified having a value N, according to which the user equipment only monitors the F-DPCH on every Nth slot. The selection of slots for providing the uplink transmission timing control information is synchronised with the US DRX cycle such that it is ensured that the uplink transmission timing control information is provided in slots that the user equipment is configured to monitor. In other words, the timing control command penodicity and offset is linked to the DL DRX cycle perioclicity and offset.
The applicant draws attention to the fact that the present invention may include any feature or combination of features disclosed herein either implicitly or explicitly or any generalisation thereof, without limitation to the scope of any definitions set out above. In view of the foregoing description it will be evident to a person skilled in the art that various modifications may be made within the scope of the invention.

Claims (28)

  1. I. A method comprising: making a transmission from a user equipment; wherein the timing of the transmission is controlled on the basis of one or more timing commands received from a base station on a channel shared between the user equipment and one or more other user equipments and on which the user equipment also receives one or more transmission power control commands.
  2. 2. A method according to claim I, wherein the transmission from the user equipment is made on an enhanced dedicated channel (E-DCH) and the one or more timing commands are received on a fractional dedicated physical channel (F-DPCH)..
  3. 3. A method according to claim I, wherein the shared channel includes providing a plurality of consecutive power control commands for the user equipment, and a timing command for said user equipment on said shared channel between groups of N of said plurality of power control commands.
  4. 4. A method according to claim 1, including controlling the timing of said transmission from the user equipment on the basis of a plurality of timing control commands received from said base station.
  5. 5. A method according to claim 1, including receiving power control commands from a first base station and receiving timing commands from a second base station, and ignoring any power control command that is received from the first base station at the same time as receiving a timing command from the second base station.
  6. 6. A method according to claim 1, wherein the user equipment is configured such that it only monitors said shared channel at selected times, which selected times are selected such that they include times at which said shared channel includes said one or more timing commands.
  7. 7. A method according to claim 1 or claim 6, wherein the shared channel is F-DPCH and is configured to contain timing control commands only at times when there is transmission to the user equipment on HS- PDSCH (High Speed Physical Downlink Shared Channel) and/or on HS-SCCH (High Speed Shared Control Channel).
  8. 8. A method comprising: sending to a user equipment one or more timing commands for controlling the timing of a transmission from the user equipment, wherein the one or more timing commands are sent on a shared channel including one or more commands for one or more other user equipments, and also including one or more power control commands for said user equipment.
  9. 9. A method according to claim 8, wherein the transmission from the user equipment is made on an enhanced dedicated channel (E-DCH) and the one or more timing commands are sent on a fractional dedicated physical channel (F-DPCH)..
    S
  10. 10. A method according to claim 8, including providing a plurality of consecutive power control commands for the user equipment on said shared channel, and providing a timing command on said shared channel between groups of N of said plurality of power control commands.
  11. 11. A method according to claim 8, wherein the user equipment is configured such that it only monitors said shared channel at selected times, and comprising sending said one or more timing commands at times at which said user equipment monitors said shared channel.
  12. 12. A method according to claim 8 or claim 11, wherein the shared channel is F-DPCH and is configured to contain timing control commands only at times when there is transmission to the user equipment on HS-PDSCH (High Speed Physical Downlink Shared Channel) and/or on HS-SCCH (High Speed Shared Control Channel).
  13. 13. A device configured to control the timing of a transmission from a user equipment on the basis of one or more timing commands received at the user equipment on a channel shared between the user equipment and one or more other user equipments and which shared channel also includes one or more transmission power control commands for the user equipment.
  14. 14. A device according to claim 13, wherein the transmission from the user equipment is made on an enhanced dedicated channel (E-DCH) and the one or more timing commands are received on a fractional dedicated physical channel (F-DPCH)..
  15. 15. A device according to claim 13, which is configured to provide a plurality of consecutive power control commands for the user equipment on said shared channel, and to provide a timing command for said user equipment on said shared channel between groups of N of said plurality of power control commands.
  16. 16. A device according to claim 13, which is configured to control the timing of said transmission from the user equipment on the basis of a plurality of timing control commands received from said base station.
  17. 17. A device according to claim 13, including receiving power control commands from a first base station and receiving timing commands from a second base station, and ignoring any power control command that is received from the first base station at the same time as receiving a timing command from the second base station.
  18. 18. A device according to claim 13, which is configured such that it only monitors said shared channel at selected times, which selected times are selected such that they include times at which said shared channel includes said one or more timing commands.
  19. 19. A device according to claim 13 or claim 18, wherein the shared channel is F-DPCH and is configured to contain timing control commands only at times when there is transmission to the user equipment on HS-PDSCH (High Speed Physical Downlink Shared Channel) and/or on HS-SCCH (High Speed Shared Control Channel).
  20. 20. A device which is configured to send to a user equipment one or more timing commands for controlling the timing of a transmission from the user equipment on a shared channel including one or more commands for one or more other user equipments, and also including one or more power control commands for said user equipment.
  21. 21. A device according to claim 20, wherein the transmission from the user equipment is made on an enhanced dedicated channel (E-DCH) and the one or more timing commands are sent on a fractional dedicated physical channel (F-DPCH)..
  22. 22. A device according to claim 20, including providing a plurality of consecutive power control commands for the user equipment on said shared channel, and providing a timing command on said shared channel between groups of N of said plurality of power control commands.
  23. 23. A device according to claim 20, which is configured such that it only monitors said shared channel at selected times, and comprising sending said one or more timing commands at times at which said user equipment monitors said shared channel.
  24. 24. A device according to claim 20 or claim 23, wherein the shared channel is F-DPCH and is configured to contain timing control commands only at times when there is transmission to the user equipment on FIS-PDSCH (High Speed Physical
    LI
    Downlink Shared Channel) and/or on HS-SCCH (High Speed Shared Control Channel).
  25. 25. A method comprising: making a transmission from a user equipment; wherein the timing of the transmission is controlled on the basis of a plurality of timing control commands received from a base station.
  26. 26. A method comprising: receiving at a user equipment power control commands from a first base station and receiving at said user equipment timing commands from a second base station for controlling the timing of one or more transmissions from the user equipment; and ignoring any power control command that is received from the first base station at the same time as receiving a timing command from the second base station.
  27. 27. A device configured to control the timing of a transmission from a user equipment on the basis of a plurality of timing control commands received from a base station.
  28. 28. A device configured to receive power control commands from a first base station and receive timing commands from a second base station for controlling the timing of one or more transmissions from the device; and to ignore any power control command that is received from the first base station at the same time as receiving a timing command from the second base station.
GB0716791A 2007-08-29 2007-08-29 Timing of wireless transmissions using a common channel Withdrawn GB2452288A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0716791A GB2452288A (en) 2007-08-29 2007-08-29 Timing of wireless transmissions using a common channel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0716791A GB2452288A (en) 2007-08-29 2007-08-29 Timing of wireless transmissions using a common channel

Publications (2)

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GB0716791D0 GB0716791D0 (en) 2007-10-10
GB2452288A true GB2452288A (en) 2009-03-04

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013051987A1 (en) * 2011-10-04 2013-04-11 Telefonaktiebolaget L M Ericsson (Publ) Controlling uplink transmit power responsive to combination of received power control commands during soft handover in a communicaton system
WO2024125418A1 (en) * 2022-12-15 2024-06-20 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Apparatus and method of uplink transmission timing management for mobility

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0693835A2 (en) * 1994-07-20 1996-01-24 SANYO ELECTRIC Co., Ltd. Synchronization of a wireless telephone
WO1996008885A2 (en) * 1994-09-16 1996-03-21 Ionica International Limited Transmission timing control in digital radio telephony
US6606341B1 (en) * 1999-03-22 2003-08-12 Golden Bridge Technology, Inc. Common packet channel with firm handoff

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0693835A2 (en) * 1994-07-20 1996-01-24 SANYO ELECTRIC Co., Ltd. Synchronization of a wireless telephone
WO1996008885A2 (en) * 1994-09-16 1996-03-21 Ionica International Limited Transmission timing control in digital radio telephony
US6606341B1 (en) * 1999-03-22 2003-08-12 Golden Bridge Technology, Inc. Common packet channel with firm handoff

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013051987A1 (en) * 2011-10-04 2013-04-11 Telefonaktiebolaget L M Ericsson (Publ) Controlling uplink transmit power responsive to combination of received power control commands during soft handover in a communicaton system
US9008042B2 (en) 2011-10-04 2015-04-14 Telefonaktiebolaget L M Ericsson (Publ) Controlling uplink transmit power responsive to combination of received power control commands during soft handover in a communication system
WO2024125418A1 (en) * 2022-12-15 2024-06-20 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Apparatus and method of uplink transmission timing management for mobility

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