WO2001047293B1 - Improved cell assignment method during group calls - Google Patents

Improved cell assignment method during group calls

Info

Publication number
WO2001047293B1
WO2001047293B1 PCT/US2000/031409 US0031409W WO0147293B1 WO 2001047293 B1 WO2001047293 B1 WO 2001047293B1 US 0031409 W US0031409 W US 0031409W WO 0147293 B1 WO0147293 B1 WO 0147293B1
Authority
WO
WIPO (PCT)
Prior art keywords
cell
mobile terminal
group call
call session
wireless communications
Prior art date
Application number
PCT/US2000/031409
Other languages
French (fr)
Other versions
WO2001047293A2 (en
WO2001047293A3 (en
Inventor
Alex Krister Raith
Original Assignee
Ericsson Inc
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 Ericsson Inc filed Critical Ericsson Inc
Priority to JP2001547895A priority Critical patent/JP2003518848A/en
Priority to MXPA02005374A priority patent/MXPA02005374A/en
Priority to AU14902/01A priority patent/AU1490201A/en
Priority to EP00977233A priority patent/EP1240796A2/en
Publication of WO2001047293A2 publication Critical patent/WO2001047293A2/en
Publication of WO2001047293A3 publication Critical patent/WO2001047293A3/en
Publication of WO2001047293B1 publication Critical patent/WO2001047293B1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0009—Control or signalling for completing the hand-off for a plurality of users or terminals, e.g. group communication or moving wireless networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H04W8/186—Processing of subscriber group data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services

Abstract

A cell assignment process strives to minimize the number of cells assigned to mobile terminals involved in any given group call session in both circuit-switched and packet-data environments. In one embodiment, when a cell assignment trigger event is encountered during a group call, the decision whether to change cells or not is based at least in part upon whether the relevant cell is already participating in that group call session with another mobile terminal or not. If so, the cell assignment process preferentially selects such a cell for switching to or avoids changing cell assignment if already assigned there. In another embodiment other cells involved in the group call session are actively sought out and the cell assignments of the mobile terminals involved in the group call session are changed to those cells, even when the signal quality may be acceptable in the current cell. The mobile terminals involved in group call sessions may optionally be given preferential priority when switching cells so as to help minimize disruption to the group call session. Thus, the mobile terminals involved in the group call session are gradually urged toward congregating in the fewest possible cells under the circumstances. Accordingly, the present invention helps provide better service with less of a system capacity penalty for group call sessions.

Claims

AMENDED CLAIMS
[received by the International Bureau on 25 September 2001 (25.09.01); original claims 1-8 and 32 cancelled; remaining claims unchanged (8 pages)]
1. Cancelled
2. Cancelled 3. Cancelled
4 Cancelled
5. Cancelled
6. Cancelled 7 Cancelled 8. Cancelled
9. A method of controlling cell assignment of a wireless communications mobile terminal during an active packet data group call session, comprising: storing a list of candidate cells including a current cell; receiving, at the mobile terminal, said list of candidate cells from a corresponding wireless communications system; determining whether at least one of said candidate cells is participating in said group call session; said mobile terminal determining whether to stay with said current cell or to select a new cell in response to a cell selection trigger event during said group call session, said mobile terminal determining to remain with the current cell if: i) said current cell provides at least minimally acceptable signal quality; and
25 ii) said current cell is participating in said group call session with another mobile terminal assigned to said current cell; and iii) no acceptable candidate cells, not including said current cell, are participating in said group call session.
10. The method of claim 9 wherein said receiving, at the mobile terminal, said list of candidate cells from the corresponding wireless communications system includes said mobile terminal receiving a message addressed to all active group members in said group call session. 11. The method of claim 10 further including said wireless communications system broadcasting a neighbor list of candidate cells and wherein said message addressed to all active group members in said group call session includes a bit map indicating which of said candidate cells on said neighbor list are active in said group call session. 12. The method of claim 9 further including said wireless communications system broadcasting a neighbor list of candidate cells on a broadcast control channel and wherein said broadcast control channel further includes information indicating which of said candidate cells on said neighbor list are active in said group call session. 13. The method of claim 9 wherein said mobile terminal determining whether to stay with said current cell or to select a new cell in response to a cell selection trigger event during said group call session is based on an algorithm that includes a bias weighting factor parameter and further including said wireless
26 communications system transmitting a message revising said bias weighting factor parameter so as to deter changes in cell selection.
14. The method of claim 13 wherein said wireless communications system transmitting a message revising said bias weighting factor parameter so as to deter changes in cell selection is performed by transmitting a broadcast message.
15. The method of claim 13 wherein said wireless communications system transmitting a message revising said bias weighting factor parameter so as to deter changes in cell selection is performed by transmitting a message addressed to all active group members in said group call session. 16. The method of claim 9 wherein said mobile terminal determining whether to stay with said current cell or to select a new cell in response to a cell selection trigger event during said group call session is based on an algorithm that includes a bias weighting factor parameter and further including preprogramming said bias weighting factor parameter into said mobile terminal so as to deter changes in cell selection into cells not actively supporting said group call session. 17.. A method of controlling cell assignment of a wireless communications mobile terminal by a wireless communications system during an active packet data group call session, comprising: storing a list of candidate cells including a current cell; determining whether at least one of said candidate cells other than said current cell is participating in said group call session; receiving notification at the corresponding wireless communications system that the mobile terminal has encountered a cell selection trigger event during said group call session;
27 01/47
thereafter, said wireiess communications system determining whether said mobile terminal should stay with the current cell or change in response to said cell selection trigger event, said wireless communications system determining that said mobile terminal should change cells unless: i) the current cell provides at least minimally acceptable signal quality to said mobile terminal; ii) the current cell is participating in said group call session with another mobile terminal assigned to said current cell; and iii) no acceptable candidate cells, not including the current cell, are participating in said group call session; said wireless communications system instructing said mobile terminal to change cells if said wireless communications system determines that said mobile terminal should change cells.
18. A method of controlling cell assignment of a wireless communications mobile terminal operating in conjunction with a wireless communications system during an active circuit switched group call, comprising: storing a list of candidate cells including a current cell at said wireless communications system; said wireless communications system determining which, if any, of said candidate cells is participating in said group call; said wireless communications system determining whether said mobile terminal should stay with the current cell or be handed off
28 to another cell in response to a haπdoff trigger event, said wireless communications system determining that said mobile terminal should be handed off to another cell unless: i) said current cell provides at least minimally acceptable signal quality to said mobile terminal; ii) said current cell is participating in said group call with another mobile terminal assigned to said current cell; and iii) no acceptable candidate cells, not including said current cell, are participating in said group call; said wireless communications system instructing said mobile terminal to change cells if said wireless communications system determines that said mobile terminal should be handed off to another cell. 19. A method of controlling cell assignment of a wireless communications mobile terminal operating in conjunction with a wireless communications system during an active circuit switched group call, comprising; communicating with said mobile terminal via a first cell during said group call; assigning a greater than normal priority to said mobile terminal and handing off said mobile terminal to a second cell with said greater than normal priority in response to a handoff trigger event during said group call.
29 01/472
20. The method of claim 19 further including said second cell maintaining a queue of channel assignment requests and further including assigning a preferential position in said queue to said handed-off group call.
21. The method of claim 20 further including said second cell maintaining a queue of channel assignment requests and further including assigning the most preferential position in said queue to said handed-off group call.
22. The method of claim 19 further including said second cell maintaining a queue of channel assignment requests and further including allowing said handed-off group call to bypass said queue. 23. The method of claim 19 wherein said second cell includes normal and reserve channels and further including allocating said handed-off group call one of said reserve channels.
24. A method of controlling cell assignment of a wireless communications mobile terminal participating in a group call session, comprising; assigning said mobile terminal to a first cell; storing a list of candidate cells including a second cell; determining if said second cell is participating in said group call session; selectively changing the cell assignment of said mobile terminal from said first cell to said second cell based on participation of said first and second cells in said group call session.
25. The method of claim 24 wherein said determining if said second cell is participating in said group call session includes determining which, if any, of said candidate cells is participating in said group call.
30 01/47293
26. The method of claim 24 wherein said selectively changing the cell assignment of said mobile terminal includes changing the cell assignment of said mobile terminal from said first cell to said second cell if: said first cell is not participating in said group call session with another mobile terminal assigned to said first cell; said second cell is participating in said group call session; and said second cell provides at least minimally acceptable signal quality to said mobile terminal.
27. The method of claim 24 wherein said selectively changing the cell assignment of said mobile terminal includes changing the cell assignment of said mobile terminal from said first cell to said second cell if: said first cell is not participating in said group call session with another mobile terminal assigned to said first cell; said second cell is participating in said group call session; and said second cell provides signal quality of better than a predetermined level to said mobile terminal.
28. The method of claim 24 wherein said mobile terminal is a first mobile terminal and further including assigning a second mobile terminal to said second cell prior to said determining if said second cell is participating in said group call session and wherein said selectively changing the cell assignment of said mobile terminal includes changing the cell assignment of said mobile terminal from said first cell to said second cell because said second mobile terminal is participating in said group call session in said second cell.
31 01/
29. The method of claim 24 wherein said first-cell belongs to a wireless communications system and wherein said determining if said second cell is participating in said group call session is performed by said wireless communications system, 30. The method of claim 24 wherein selectively changing the cell assignment of said mobile terminal from said first cell to said second cell based on participation of said first and second cells in said group call session includes said mobile terminal controlling said selectively changing the ceil assignment of said mobile terminal from said first cell to said second cell based on participation of said first and second cells in said group call session,
31. The method of claim 29 wherein selectively changing the cell assignment of said mobile terminal from said first cell to said second cell based on participation of said first and second cells in said group call session includes said wireless communications system controlling said selectively changing the cell assignment of said mobile terminal from said first cell to said second cell based on participation of said first and second cells in said group call session
32. Cancelled
32
STATEMENT UNDER ARTICLE 19(1)
Pursuant to Article 19(1) the claims have been amended. in particular, claims 1 through 8 and 32 have been cancelled to provide a more concise presentation of the claims.
Claims 9 thorugh 31 remain unchanged.
Enclosed please find replacement pages 15 through 23 to replace pages 15 through 25 of the original application.
33
PCT/US2000/031409 1999-12-20 2000-11-15 Improved cell assignment method during group calls WO2001047293A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2001547895A JP2003518848A (en) 1999-12-20 2000-11-15 Improved cell allocation method during group call
MXPA02005374A MXPA02005374A (en) 1999-12-20 2000-11-15 Improved cell assignment method during group calls.
AU14902/01A AU1490201A (en) 1999-12-20 2000-11-15 Improved cell assignment method during group calls
EP00977233A EP1240796A2 (en) 1999-12-20 2000-11-15 Improved cell assignment method during group calls

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/467,711 US6725052B1 (en) 1999-12-20 1999-12-20 Cell assignment method during group calls
US09/467,711 1999-12-20

Publications (3)

Publication Number Publication Date
WO2001047293A2 WO2001047293A2 (en) 2001-06-28
WO2001047293A3 WO2001047293A3 (en) 2002-01-10
WO2001047293B1 true WO2001047293B1 (en) 2002-01-31

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Family Applications (1)

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PCT/US2000/031409 WO2001047293A2 (en) 1999-12-20 2000-11-15 Improved cell assignment method during group calls

Country Status (8)

Country Link
US (1) US6725052B1 (en)
EP (1) EP1240796A2 (en)
JP (1) JP2003518848A (en)
CN (1) CN1237838C (en)
AR (1) AR028882A1 (en)
AU (1) AU1490201A (en)
MX (1) MXPA02005374A (en)
WO (1) WO2001047293A2 (en)

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Also Published As

Publication number Publication date
WO2001047293A2 (en) 2001-06-28
AR028882A1 (en) 2003-05-28
MXPA02005374A (en) 2002-11-29
EP1240796A2 (en) 2002-09-18
JP2003518848A (en) 2003-06-10
US6725052B1 (en) 2004-04-20
WO2001047293A3 (en) 2002-01-10
CN1411670A (en) 2003-04-16
AU1490201A (en) 2001-07-03
CN1237838C (en) 2006-01-18

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