Method and apparatus for synchronizing radio ports in a commnuication system

Claim 3

A communication system, comprising: a network controller for transmitting a multiframe synchronization event over a single communication channel; a radio port for receiving the multiframe synchronization event, said radio port including means of determining if the multiframe synchronization event is error free; and said radio port synchronizing to the network controller when the multiframe synchronization event is error free.

Claim 4

A communication system, comprising: a network controller for transmitting a multiframe synchronization event over a single communication channel; a radio port for receiving the multiframe synchronization event, said radio port including means of determining if the multiframe synchronization event is error free; and said radio port synchronizing to the network controller when the multiframe synchronization event is error free.

Claim 5

A communication system as described in claim 2, wherein the communication system is a digital European cordless telephone (DECT) system.

Claim 8

A method as described in claim 4, wherein a cyclic redundancy check (CRC) calculation is done to determine if the signaling information is error free.

Claim 9

A method as described in claim 4, wherein the step of receiving includes the step of using a state machine to receive the digital signaling information transmitted by the network controller; and the step of synchronizing includes the step of controlling the synchronization of the radio port to the network controller using the state machine.

Claim 10

A method as described in claim 4, wherein the step of receiving includes the step of using a universal asynchronous receiver/transmitter to receive the digital signaling information transmitted by the network controller; and the step of synchronizing includes the step of controlling the synchronization of the radio port to the network controller using the universal asynchronous receiver/transmitter.

Claim 13

A method of providing synchronization between a radio port and a network controller as described in claim 8, wherein the step of synchronizing includes the steps of: disassembling the detected synchronization packet; performing a second cyclic redundancy check calculation on the multiframe number; and determining if the synchronization packet is error free based on the second cyclic redundancy check calculation.

Claim 16

A method of synchronizing a plurality of radio ports to a network controller as described in claim 10, wherein the step of broadcasting includes the step of using a single predetermined communication channel to broadcast the multiframe number from the network controller to the plurality of radio ports.

Claim 17

A method of synchronizing a plurality of radio ports to a network controller as described in claim 10, further comprising the steps of: providing a chain of counters within the network controller; sourcing the chain of counters with the time reference; and generating the multiframe number from the chain of counters in accordance with the predetermined communication protocol.

Claim 18

A method of synchronizing a plurality of radio ports to a network controller as described in claim 12, wherein the step of generating a multiframe number includes the steps of: incrementing a pulse code modulated (PCM) frame count after a predetermined amount of time has elapsed based on the time reference; comparing the PCM frame count to a predetermined PCM limit; incrementing a second frame count when the PCM frame count reaches its predetermined PCM limit; comparing the second frame count to a predetermined frame limit; incrementing a multiframe count when the second frame count reaches its predetermined frame limit; comparing the multiframe count to a predetermined multiframe limit; and initiating a multiframe event when the multiframe count reaches its predetermined multiframe limit.

Claim 19

A method of synchronizing a plurality of radio ports to a network controller as described in claim 13, wherein the step of initiating a multiframe event includes the steps of: generating a synchronization word; appending the result of the performed CRC calculation onto the multiframe number; and transmitting the synchronization word, the multiframe number, and the appended CRC result onto the single predetermined communication channel as a synchronization packet to the plurality of radio ports.

Claim 20

A method of synchronizing a plurality of radio ports to a network controller as described in claim 14, further comprising the steps of: receiving the simultaneous broadcast at the radio ports; disassembling the synchronization packet; performing a predetermined CRC calculation on the synchronization packet; validating the performed CRC calculation; and determining if the synchronization packet is error free based on the step of validating the performed CRC calculation.

Claim 21

A method of synchronizing a plurality of radio ports to a network controller as described in claim 15, further comprising the steps of: detecting the synchronization word at the plurality of radio ports; starting a delay timer in response to the synchronization word; determining when the delay timer expires; and loading a multiframe counter with the multiframe number and resetting a series of bit, slot, and frame counters to zero when the delay timer expires and the synchronization packet is error free.

Claim 22

A communication system, comprising: a network controller for transmitting a synchronization packet, said network controller including: a reference timer; a multiframe synchronization generator comprising: a series of counters clocked by the reference timer and generating a multiframe number, said multiframe number being incremented in response to the series of counters; a network controller state machine monitoring the series of counters and generating a synchronization word when the multiframe number is incremented; a network controller cyclic redundancy checker for generating a check byte in response to the multiframe number; said network controller state machine transmitting the synchronization word, multiframe number, and check byte as the synchronization packet; and a radio port for receiving the synchronization packet, said radio port including: a multiframe synchronization detector including: a packet disassembler for reformatting the synchronization packet; a synchronization word detector for detecting the synchronization word; a radio port cyclic redundancy checker generating a check byte based on the received synchronization packet, said check byte determining if the receive synchronization packet is error free; a radio port state machine for monitoring the status of the radio port cyclic redundancy checker; and a series of counters responsive to the radio port state machine, a portion of said counters being updated with the multiframe number when the synchronization packet is error free while the remainder of said series of counters are reset; and said network controller and said radio port being synchronized when the series of counters are updated with the multiframe number and the remainder of the series of counters are reset to zero.

Claim 23

A communication system, comprising: a network controller for transmitting a synchronization packet, said network controller including: a reference timer; a multiframe synchronization generator comprising: a series of counters clocked by the reference timer and generating a multiframe number, said multiframe number being incremented in response to the series of counters; a network controller state machine monitoring the series of counters and generating a synchronization word when the multiframe number is incremented; a network controller cyclic redundancy checker for generating a check byte in response to the multiframe number; said network controller state machine transmitting the synchronization word, multiframe number, and check byte as the synchronization packet; and a radio port for receiving the synchronization packet, said radio port including: a multiframe synchronization detector including: a packet disassembler for reformatting the synchronization packet; a synchronization word detector for detecting the synchronization word; a radio port cyclic redundancy checker generating a check byte based on the received synchronization packet, said check byte determining if the receive synchronization packet is error free; a radio port state machine for monitoring the status of the radio port cyclic redundancy checker; and a series of counters responsive to the radio port state machine, a portion of said counters being updated with the multiframe number when the synchronization packet is error free while the remainder of said series of counters are reset; and said network controller and said radio port being synchronized when the series of counters are updated with the multiframe number and the remainder of the series of counters are reset to zero.

Claim 24

A communication system as described in claim 17, wherein the radio port further comprises: a programmable delay portion responsive to the radio port state machine and providing a predetermined delay time when the synchronization packet is error free, said series of counters being updated when the predetermined delay time has expired.

Claim 25

A communication system, comprising: a network controller for transmitting a synchronization event including a synchronization packet and break character, said network controller including: a reference timer; a multiframe synchronization generator comprising: a series of counters clocked by the reference timer and generating a multiframe number, said multiframe number being incremented in response to the series of counters; a state machine monitoring the series of counters and generating the break character and a flag when the multiframe number is incremented; a cyclic redundancy checker for generating a check byte in response to the multiframe number; said state machine transmitting the flag, multiframe number, and check byte as the synchronization packet and also transmitting the break character; and a radio port for receiving the synchronization event, said radio port including a universal asynchronous receiver and transmitter (UART) for sampling the synchronization packet using a universal asynchronous receiver and transmitter protocol; and said universal asynchronous receiver and transmitter generating a synchronization pulse in response to the break character; and said state machine of the network controller providing signaling substantially similar to the universal asynchronous receiver and transmitter protocol.

Claim 26

A communication system, comprising: a network controller for transmitting a synchronization event including a synchronization packet and break character, said network controller including: a reference timer; a multiframe synchronization generator comprising: a series of counters clocked by the reference timer and generating a multiframe number, said multiframe number being incremented in response to the series of counters; a state machine monitoring the series of counters and generating the break character and a flag when the multiframe number is incremented; a cyclic redundancy checker for generating a check byte in response to the multiframe number; said state machine transmitting the flag, multiframe number, and check byte as the synchronization packet and also transmitting the break character; and a radio port for receiving the synchronization event, said radio port including a universal asynchronous receiver and transmitter (UART) for sampling the synchronization packet using a universal asynchronous receiver and transmitter protocol; and said universal asynchronous receiver and transmitter generating a synchronization pulse in response to the break character; and said state machine of the network controller providing signaling substantially similar to the universal asynchronous receiver and transmitter protocol.