Method for communicating in a wireless communication system

• US 6,144,653 A
• Filed: 06/10/1998
• Issued: 11/07/2000
• Est. Priority Date: 11/01/1993
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Turcotte, Joseph Eric, Persson, Bengt
• Primary Examiner(s): Patel, Ajit
• Application Number:
  US09/095,104
• Time in Patent Office: 881 Days
• Field of Search: 370/328, 370/321, 370/331, 370/332, 370/337, 370/347, 370/442, 455/67.3, 714/704, 714/706, 714/758, 714/752, 714/746, 340/825.44
• US Class Current: 370/337
• CPC Class Codes: H04B 7/2643 using time-division multiple access [TDMA] H04B7/2615, H04B7/2618 take precedence
• CPC Class Codes: H04B 7/2656 for structure of frame, burst
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0046 Code rate detection or code type detection H04L1/0038 takes precedence; detection of the data rate H04L25/0262; for packet format H04L1/0091
• CPC Class Codes: H04L 1/0056 Systems characterized by the type of code used H04L1/08 takes precedence
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0059 Convolutional codes
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1614 using bitmaps
• CPC Class Codes: H04L 1/1685 the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/1803 Stop-and-wait protocols
• CPC Class Codes: H04L 1/1809 Selective-repeat protocols
• CPC Class Codes: H04L 1/1848 Time-out mechanisms
• CPC Class Codes: H04L 1/188 Time-out mechanisms
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 2001/0093 : Point-to-multipoint
• CPC Class Codes: H04L 9/40 : Network security protocols
• CPC Class Codes: H04W 36/30 : by measured or perceived connection quality data
• CPC Class Codes: H04W 48/10 : using broadcasted information
• CPC Class Codes: H04W 48/16 : Discovering, processing access restriction or access information
• CPC Class Codes: H04W 48/20 : Selecting an access point
• CPC Class Codes: H04W 52/0212 : managed by the network, e.g. network or access point is master and terminal is slave
• CPC Class Codes: H04W 52/0245 : according to signal strength
• CPC Class Codes: H04W 68/00 : User notification, e.g. alerting and paging, for incoming communication, change of service or the like
• CPC Class Codes: H04W 68/025 : Indirect paging
• CPC Class Codes: H04W 88/02 : Terminal devices
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

A communications system in which information is transmitted in a plurality of time slots grouped into a plurality of superframes which are, in turn, grouped into a plurality of paging frames. A remote station receives paging messages once in each paging frame.

Claims

1. A method for monitoring radio link quality in a radiocommunication system comprising the steps of:

initializing a counter;

performing a cyclic redundancy check (CRC) on information read during a timeslot of a paging frame;

incrementing said counter if said CRC is successful;

decrementing said counter if said CRC fails; and

indicating a radio link failure when said counter reaches zero.

2. The method of claim 1, wherein said step of initializing said counter further comprises the step of:

setting said counter to value of ten.

3. The method of claim 1, further comprising the step of:

once a radio link failure occurs, performing measurements on frequencies identified in a neighbor list.

4. The method of claim 2, further comprising the step of:

truncating a value of said counter such that it does not exceed ten.

5. The method of claim 1, further comprising the step of:

using said CRC from only one timeslot per paging frame to update said counter.

6. A mobile station comprising:

a receiver for receiving information in a timeslot of a paging frame;

a counter; and

a processor configured to;

initialize said counter when said mobile station camps on a control channel;

perform a CRC on said information; and

selectively update said counter based on a result of said CRC.

7. The mobile station of claim 6, wherein said processor is further configured to initialize said counter to a value of 10.

8. The mobile station of claim 6, wherein said processor is further configured to indicate a radio link failure when said counter reaches zero.

9. The mobile station of claim 8, wherein said processor is further configured to perform signal strength measurements on frequencies in a neighbor list when said radio link failure is declared.