Minimal maintenance link to support synchronization
First Claim
1. A method for supporting wireless communications, the method comprising:
- assigning a plurality of pseudorandom noise (PN) codes for use by a field unit;
transmitting an indication of the plurality of PN codes to the field unit;
receiving a first message in at least one time slot, wherein the first message includes one of the plurality of PN codes, and the one of the plurality of PN codes is associated with a type of field unit request;
analyzing the one of the plurality of PN codes to determine a timing adjustment to be made at the field unit to synchronize the field unit with a base station; and
transmitting a second message to the field unit that includes the timing adjustment, wherein the timing adjustment indicates an amount to advance timing and alternatively an amount to retard timing.
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0 Petitions
Accused Products
Abstract
Multiple field units in a CDMA system are synchronized for communication with a base station using a shared forward and reverse link channel. Each field unit is assigned a time slot in a forward link channel to receive messages from the base station. Likewise, each field unit is assigned a time slot on a common reverse link channel for transmitting messages to the base station. Timing alignment among each of many field units and the base station is achieved by analyzing messages received at the base station in a corresponding time slot from each field unit. Thereafter, a message is transmitted in a corresponding time slot to a particular field unit from the base station for adjusting its timing so that future messages transmitted from the field unit are received in the appropriate time slot at the base station. In this way, minimal resources are deployed to maintain communication and precise synchronization between a base station and each of multiple users, minimizing collisions between field units transmitting in adjacent time slots on the reverse link.
442 Citations
33 Claims
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1. A method for supporting wireless communications, the method comprising:
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assigning a plurality of pseudorandom noise (PN) codes for use by a field unit; transmitting an indication of the plurality of PN codes to the field unit; receiving a first message in at least one time slot, wherein the first message includes one of the plurality of PN codes, and the one of the plurality of PN codes is associated with a type of field unit request; analyzing the one of the plurality of PN codes to determine a timing adjustment to be made at the field unit to synchronize the field unit with a base station; and transmitting a second message to the field unit that includes the timing adjustment, wherein the timing adjustment indicates an amount to advance timing and alternatively an amount to retard timing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A base station operable in a wireless communication network, the base station comprising:
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a transmitter configured to transmit an indication of a plurality of pseudorandom noise (PN) codes to a field unit; and a receiver configured to receive a message containing a PN code from a field unit to determine a timing adjustment to be made at the field unit to synchronize the field unit with the base station, wherein the received PN code is associated with a type of field unit request; wherein the transmitter is further configured to transmit a feedback message to the field unit containing the timing adjustment, wherein the timing adjustment indicates an amount to advance timing and alternatively an amount to retard timing. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A field unit operable in a wireless communication network, the field unit comprising:
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a receiver configured to receive an indication of a plurality of pseudorandom noise (PN) codes from a base station; and a transmitter configured to transmit a PN code selected from the plurality of PN codes indicated by the base station, wherein the selected PN code is associated with a type of field unit request; wherein the receiver is further configured to receive, from the base station, a feedback message based on the transmitted PN code, wherein the feedback message contains a timing adjustment that indicates an amount to advance timing and alternatively an amount to retard timing. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A method for use in a field unit operable in a wireless communication network, the method comprising:
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receiving an indication of a plurality of pseudorandom noise (PN) codes from a base station; selecting a PN code from the plurality of PN codes indicated by the base station, wherein the selected PN code is associated with a type of field unit request; transmitting the selected PN code to the base station; and receiving a message, from the base station, based on the transmitted selected PN code, wherein the message contains a timing adjustment that indicates an amount to advance timing and alternatively an amount to retard timing. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33)
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Specification