Nova Patents
EP1501322A2

Wireless communication unit, wireless communication system and method of communication

Abstract

A wireless subscriber communication unit (300) is capable of communication on a direct mode communication system (200) employing a timing structure (100) that does not support private full-duplex communication. The wireless subscriber communication unit (300) comprises a signal-processing unit (308) having a private full-duplex call function (340) configured to recognise a request for a private full-duplex communication and, in response to such a recognition, modify the unit's use of the timing structure (400) to perform private full-duplex communication.

EP1501322A2, drawing sheet 1
Sheet 1 of 3

Term

Term ended

Projected expiry passed 16 June 2024, 2.3 years ago.

  1. Priority
  2. Filed
  3. Published
  4. Projected expiry
  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, wherein the wireless subscriber communication unit (300) includes a signal processor (308) having a private full-duplex call function (340) operable to recognise a request for a private full-duplex communication and, 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 DMO 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 an opportunity to perform any one or more of the ways (i), (ii), (iii) and (iv).
  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 system signalling 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 comprises removing an opportunity to perform any one or more of ways (i), (ii), (iii) or (iv).
  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