Nova Patents
EP1501322B1

Wireless communication unit, wireless communication system and method of communication

Abstract

This record has no abstract on file.

EP1501322B1, drawing sheet 1
Sheet 1 of 2

Term

Term ended

Expired 16 June 2024, 2.3 years ago.

  1. Priority
  2. Filed
  3. Granted
  4. Expired
  5. Today

12 claims: 5 independent, 7 dependent

  1. 1
    A wireless subscriber communication unit (300) capable of communication in a direct mode communication system (200) employing a timing structure (100) that does not support private full-duplex communication, characterized by the wireless subscriber communication unit (300) including a signal processor (308) having a private full-duplex call function (340) operable:(i) to recognise a request for a private full-duplex communication;and (ii) in response to such a recognition, to modify operation of the wireless subscriber communication unit to perform private full-duplex communication, wherein the modification includes reducing a number of slots in the timing structure designated for use in DMQ, Direct Mode Operation, system signalling to make such slots available for private full-duplex communication.
  2. 2
    A wireless subscriber communication unit (300) according to Claim 1, wherein the private full-duplex call function (340) is operable to modify the use by the wireless subscriber communication unit of the timing structure in one or more of the following ways:(i) to reduce a number of symbol timing recovery opportunities for a called wireless subscriber communication unit;(ii) to reduce a number of late entry opportunities for the wireless subscriber communication unit;(iii) to reduce a number of call pre-emption opportunities for the wireless subscriber communication unit;and (iv) to reduce a number of linearisation opportunities for the wireless subscriber communication unit (300).
  3. 3
    A wireless subscriber communication unit (300) according to Claim 2, wherein the private full-duplex call function (340) is operable to modify the use by the wireless subscriber communication unit of the timing structure by removing a number of any one or more of the symbol timing recovery opportunities, the late entry opportunities, the pre-emption opportunities, and the linearisation opportunities for the wireless subscriber communication unit (300).
  4. 4
    A wireless subscriber communication unit (300) according to any one preceding Claim, wherein the private full-duplex call function (340) is operable to modify a transmit protocol data unit to indicate a user requesting a private full-duplex communication.
  5. 5
    A wireless subscriber communication unit (300) according to any one preceding Claim, wherein the wireless subscriber communication unit (300) is operable to communicate in a digital communication system based on interleaving of user data, U-PLANE, with control channel data, C-PLANE, such that the digital communication system is not controlled by a dedicated controlling centre.
  6. 6
    A wireless subscriber communication unit (300) according to any one preceding Claim, wherein the wireless subscriber communication unit (300) is capable of communicating in a TETRA direct mode of operation.
  7. 7
    A method (500) of communicating in a wireless direct mode communication system supporting communication between a plurality of wireless communication units via a timing structure, such that the timing structure (100) does not support private full-duplex communication; wherein the method is characterised by the steps of:recognising (510) a request for a private full-duplex communication;and modifying (520), in response to such a recognition, a use of the timing structure (400) to perform private full-duplex communication, wherein the modification includes reducing a number of slots in the timing structure designated for use in DMO, Direct Mode Operation), system signaling, to make such slots available for private full-duplex communication.
  8. 8
    A method of communicating in a wireless direct mode communication system according to Claim 7, wherein the method is further characterised by the step of:receiving (510) a call set-up request that includes a flag or modified protocol data unit to indicate a request for a private full-duplex communication.
  9. 9
    A method of communicating in a wireless direct mode communication system according to Claim 7 or Claim 8, wherein the step of modifying (520) comprises one or more of the following:(i) reducing a number of symbol timing recovery opportunities for a called wireless subscriber communication unit;(ii) reducing a number of late entry opportunities for the wireless subscriber communication unit;(iii) reducing a number of call pre-emption opportunities for the wireless subscriber communication unit;and (iv) reducing a number of linearisation opportunities for the wireless subscriber communication unit (300).
  10. 10
    A method of communicating in a wireless dual-mode communication system according to Claim 9, wherein the steps of reducing comprise removing a number of any one or more of the symbol timing recovery opportunities, the late entry opportunities, the pre-emption opportunities, and the linearisation opportunities for the wireless subscriber communication unit (300).
  11. 11
    A method according to any one of claims 7 to 10 wherein a radio frequency transmission message is sent from a first wireless communication unit to a second wireless communication unit on the wireless direct mode communication system (200), wherein the radio frequency transmission message comprises an element or flag indicating a call set-up request for a private full-duplex communication that requires the second communication unit to adapt its use of a wireless direct mode communication system's timing structure.
  12. 12
    A method according to any one of claims 7 to 11, wherein the method operates by a timing structure according to the TETRA direct mode protocol.
Independent claims12