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Control signal transmission in digital radio telephony
| Details |
Inventors: Albrow, Richard John; Black, Simon Alexander; Carter, Leigh; Goodings, Rupert Leslie Alexander; Martin, Paul Maxwell; Piercy, Neil Philip;
Assignee: Ionica International Limited (Cambridge, GB)
Primary Examiner: Pham; Chi H.
Assistant Examiner: Duong; Frank
Attorney, Agent or Firm: Fish & Richardson P.C.
In transmission between a base station and a subscriber unit, system control signals are sent in time slots within fixed length time frames. The system control signals are fragmented, each fragment being sent in a different time slot of a frame. |
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DETAILED DESCRIPTION We claim: 1.
A method of transmission of system broadcast control signals in time slots within fixed length time frames, comprising: coding said system broadcast control signals into data units, said system broadcast control signals representative of at least one of: a paging message addressed to a specific subscriber unit, a message allocating traffic channels in response to a request from a subscriber unit to set-up a call, a message addressed and sent to a specific subscriber unit despite no traffic channel being allocated, a list of channels available to subscriber units, and a list of time slots available for call set-up requests, fragmenting each data unit into fragments sending each fragment in a different time slot of one of the fixed length time frames, transmitting the fragmented system broadcast control signal from a base station to at least one subscriber unit, wherein the data units are transmitted on all of the plurality of radio frequency carrier signals transmitted from the base station and the transmission of frames on all the radio frequency carriers are synchronized so as to enable the at least one subscriber unit to correctly receive system control signalling from any of radio frequency carriers received.
2.
A method according to claim 1, wherein transmitting the fragmented system broadcast control signal is by radio.
3.
A method according to claim 1, in which the frame comprises one fragment per time slot.
4.
A method of transmission of system control signals according to claim 1, in which each subscriber unit is at a fixed location.
5.
A method according to claim 1 in which the fragments are of predetermined length and take a predetermined position within each slot.
6.
A method according to claim 1 in which the fragments are of equal fixed length.
7.
A method according to claim 1 in which each slot also carries other data such as speech data.
8.
A method according to claim 1 in which each data unit includes a header and error correction data in addition to system control signalling
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