KR100861484B1 - Overhead Message Updates by Distributed Control - Google Patents

Abstract

The method and system of the present invention provide a simple but efficient technique for delivering overhead messages while minimizing power consumption and reducing bandwidth in a wireless communication system providing access to a distributed network. In one embodiment, the wireless base station connected to the distributed network sends a signature sequence for the overhead message to the mobile unit. The mobile unit wakes up to receive the signature and compares it with the signature stored in the mobile unit. If the signature received at the mobile unit is different from the signature stored at the mobile unit, the mobile unit stays awake to receive the overhead message to be sent by the wireless base station. If the signature received at the mobile unit and the signature stored at the mobile unit are the same, the mobile unit will return to sleep mode.

Description

Overhead message update by distributed control {OVERHEAD MESSAGE UPDATE WITH DECENTRALIZED CONTROL}

1 is a block diagram of a wireless communication system in accordance with a preferred embodiment of the present invention.

2 illustrates a structure of a forward link of a wireless communication system according to the present invention.

FIG. 3 illustrates a process for conveying an overhead message using the structure of the forward link shown in FIG.

4 illustrates another structure of a forward link of a wireless communication system in accordance with the present invention.

FIG. 5 illustrates another process for delivering overhead messages using the structure of the forward link shown in FIG.

* Description of Signs of Main Parts of Drawings *

200: wireless communication system 210, 220: base station

212: base station transceiver subsystem 250: the Internet

TECHNICAL FIELD The present invention relates to wireless communication systems, and more particularly, to overhead channel information delivery in wireless communication systems.

In a cellular communication system, the area to be serviced is divided into a number of small areas called cells, and one base station (BS) is arranged to provide service or coverage to mobile units within the cell. Each BS is connected to a mobile station controller (BSC), which controls several BSs and controls the provision of communication services to the mobile unit as the mobile unit moves from cell to cell. The BSC is then connected to a mobile switching center (MSC), which is typically a telephone exchange with special software that handles mobility for the mobile unit. Most cellular communication systems each have its own BS and consist of a number of MSCs interconnected by fixed links. The MSC is interconnected to the public switched telephone network (PSTN) for incoming and outgoing calls from fixed phones.

The mobile unit is ultimately connected to the MSC via an over-the air radio frequency (RF) reverse (mobile to BS) link to the BS and an RF forward (BS to mobile unit) link from the BS. Through these links, RF signals are exchanged between each mobile unit and one or more base stations. The mobile units do not communicate directly with each other. Mobile unit to mobile unit communication occurs between the distances of one or more cells through a base station that provides service to a mobile unit wishing to communicate. The base station communicates with the BSC through various media such as, for example, ground wire or microwave links. The BSC may route the call to the PSTN through the MSC or may route the packet to a packet switching network such as the Internet. The base station controller also coordinates base station operation in the system, for example during handoff.

A common feature of the RF forward and reverse links of many cellular systems is that there are many users using a single communication channel that occupies a limited frequency range. Cellular systems employ several techniques to allow multiple users to use a single communication channel that occupies a limited frequency range. Code Division Multiple Access (CDMA) is one such technique. The general CDMA standard is shown in the TIA / EIA standard TIA / EIA-95-B entitled "Mobile Station-Base Station Compatibility Standard for Dual Mode Wideband Spread Spectrum Cellular Systems". In CDMA, multiple users can use the entire communication channel simultaneously without adjusting the transmission timing or the portion of the communication channel used by each user. Details of CDMA and spread spectrum communications can be found in 1996 in the CDMA Principles of Spread Spectrum Communications from Edison-Wesley Publishing Company, Reading, Andrew J. Viterbi, Massachusetts. In contrast to CDMA, two other multiple access techniques are adjusting the user transmission timing (time division multiple access (TDMA)) or adjusting the portion of the communication channel used by the user (frequency division multiple access (FDMA)). .

Regardless of the technique used to provide multiple access, in a typical cellular system, the forward communication link includes one or more data channels, pilot channels, and one or more paging channels, all of which are transmitted from the base station to the mobile unit. The pilot channel or pilot signal defines the boundary of the cell area provided by the base station. In CDMA cellular systems according to IS-95, the pilot signal serves another purpose as well. For example, the pilot signal provides time reference, amplitude and phase tracking; And allow mobile units to identify and synchronize with multiple base stations within their communication capacity range. The data channel set carries data associated with various communication sessions (generally phone calls) and is delivered to individual mobile units. These data channels are sometimes referred to as traffic channels. The paging channel is used by the base station to inform the mobile unit when a communication request is received. Paging channels are also used to send overhead messages. The overhead message includes information that enables mobile unit to base station communication.

The overhead message is not addressed to any particular mobile unit but rather to distribute to each mobile unit in the corresponding coverage area. There are four types of overhead messages in an IS-95 CDMA cellular system: system parameters, access parameters, channel list, and neighbor list overhead messages. Each type of overhead message must be broadcast at least once per second. For example, the neighbor list overhead message continuously broadcasts a list of neighbor base stations that can communicate. The mobile unit uses the neighbor list to monitor the signal from the neighbor base station as it enters the coverage area of the neighbor base station. Cellular systems using different communication standards have different types of overhead messages.

Overhead messages are generally received and processed by the mobile unit when the mobile unit is not associated with or is about to be associated with the call (ie, is in an "idle state"). The term idle state is a slightly different concept because the mobile unit can be very busy even in the idle state. During the idle state, the mobile station wakes up periodically and listens to the paging channel to process messages on that channel. The overhead message may remain the same for the next time period in which the mobile station wakes up periodically and listens to the paging channel. Since the mobile unit wakes up only to determine if the overhead message is the same as the previously decoded previous message, and receiving and decoding the overhead message is undesirable in terms of battery power conservation, the sequence number is associated with the overhead message. Are sent together. When the mobile unit wakes up, the mobile unit receives the sequence number of the overhead message and decides to wake up and receive the overhead message. In many cases, the mobile unit returns to sleep mode after receiving the sequence number because the sequence number is the same as the sequence number received at the last time the mobile unit waked up. Since listening to overhead messages requires a certain amount of power and the listening function is performed frequently (once per second), limiting the time the mobile unit performs the listening function reduces the overall power consumption of the mobile unit. This increases the life of the battery or other power storage system used by the mobile unit. In many cases, overhead messages can remain the same for significant periods of time, which can result in significant power savings.

In many cellular systems, the overhead messages and sequence numbers to be sent by the base station are controlled from a central location, such as a base station manager (BSM). The reason for this central control is due to the nature of the services typically provided by cellular systems. Cellular services generally provide access to voice services or land PSTNs. In general, PSTNs have a highly concentrated exchange structure. As a result, the cellular system that wants to interface with the PSTN must use a central office to route calls. In many cellular systems that provide voice services over the PSTN, telephone calls are bundled at a central office (MSC or MSCs) for transmission over the PSTN or unbundled for transmission over the wireless network. Thus, due to the presence of a central location (BSM or MSC) where the links from many BSs are terminated, at each base station of the cellular system, the central location can be used to remotely control the programming of overhead messages and sequence numbers from the central location. It is desirable to take this advantage.

In contrast, cellular systems that provide packet data services rather than voice services generally interface with highly distributed networks. An example of a distributed network is the Internet. Cellular systems that provide packet data services provide users from cellular system users to routers that link users to distributed networks. Technically, the Internet is a collection of standard protocols, such as Transmission Control Protocol / Internet Protocol (TCP / IP), which allows disparate computer systems and networks to transmit and receive information. Some of the most popular protocols are email (electronic messaging), file transfer protocol (file transfer), the world wide web (graphical interface using links by hypertext documents), telnet (telephone network connection), and IRC (internet relay charts). ), Gophor (information organization).

The message received from the mobile user of the packet data cellular system is delivered by the base station to the router. The router breaks up the message into smaller pieces called packets. Packets are sent individually over the network, but when all the message fragments reach their destination they are eventually reconstructed. During a trip, packets are simply bumped from one router to another and through bridges and switches. No specific path is selected from the beginning. Each router or switch can see the destination address of the packet but does not examine its contents and determines the best path.

In general, routers connect directly to a distributed network and typically transmit data along multiple paths to their destinations, so there is often no need to switch from a central location to form a single path to the destination. As a result, in a wireless data system that provides access to a distributed network, there is no need for a central location such as a BSM or MSC that can be used to control the base station and to control the updating of overhead messages in the cellular system.

Thus, there is a need to convey overhead messages in wireless communication systems such as cellular systems that provide access to distributed networks. The present invention meets these needs.

Accordingly, it is an object of the present invention to provide a simple but efficient technique for delivering overhead messages while minimizing power consumption and reducing bandwidth in a wireless communication system providing access to a distributed network.

In one embodiment, the wireless base station connected to the distributed network sends a signature sequence for the overhead message to the mobile unit. The mobile unit wakes up to receive the signature and compares it with the signature stored in the mobile unit. If the signature received at the mobile unit is different from the signature stored at the mobile unit, the mobile unit stays awake to receive the overhead message to be sent by the wireless base station. If the signature received at the mobile unit and the signature stored at the mobile unit are the same, the mobile unit will return to sleep mode.

In an alternative embodiment, the mobile unit wakes up and receives a message from the wireless base station. The mobile unit uses the message to generate a signature. The mobile unit compares this signature with the signature of a previous message received at the mobile unit. If the signature generated for the received message is the same as the signature of the previously received message, the mobile unit goes back to sleep mode. If the signature generated by the received message is different from the signature of the previously received message, the mobile unit updates the operating parameters used to communicate with the base station.

1 is a system block diagram of a wireless communication system (CS or system) 200 in accordance with a preferred embodiment of the present invention. System 200 may include multiple base stations (BS) 210, 220 (only two are shown), each of which is within the topographical area covered by mobile unit (MU) 202 by the base station. When present, it may wirelessly communicate with the MU 202. The MU 202 includes a terminal device (TE) 206 and a mobile terminal (MT) 204.

An MU refers to a constituent entity consisting of a terminal device and a mobile terminal. In this description, the term "mobile unit" refers to a remote subscriber station for explanation. However, the mobile unit can be fixed. The mobile unit can be part of a multi-user centralized subscriber system. The mobile unit can be used to transmit voice, data or their combined signal types. The term "mobile unit" is a technical term and is not intended to limit the scope or functionality of the unit.

Base stations 210 and 220 include base station transceiver subsystems (BTSs) 212 and 222 and radio link protocols and signaling managers (RSMs) 214 and 224. A base station refers to a constituent entity consisting of BTS and RSM.

TE 206 is a device that provides a user interface such as a laptop or notebook computer, or a personal digital assistant (PDA). TE 206 is coupled to MT 204, which is a wireless device that provides data modulation and demodulation capabilities. The BTSs 210 and 220 are connected to the MU 202 via an air interface of radio frequencies (RF). BTSs 210 and 220 provide data modulation and demodulation capabilities for connecting to MU 202. RSMs 214 and 224 act as radio link protocol (RLP) endpoints and signaling endpoints and map network protocol addresses and mobile station identifiers to each other. There may be a single RSM or an RSM co-located with each BTS.

System 200 includes a router 230. Router 230 connects RSMs 214 and 224 to a distributed network 250 comprised of a router (not shown) and another network (not shown). One example of a distributed network is the Internet. System 200 may be connected to other types of distributed and / or centralized networks.

The RF air interface between the BTSs 210 and 220 and the MU 202 includes a forward link for communication from the BTS to the mobile unit and a reverse link for communication from the mobile unit to the BTS. In one embodiment, the forward link of system 200 is entirely assigned to a single mobile unit at a given moment, or only a single forward channel is sent to the mobile unit at a given moment. There may be many types of communication standards in which the present invention may be used. One standard for forward and reverse links in wireless communication systems is the TIA / EIA standard TIA / EIA-95-B (or IS-95) entitled “Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular Systems”. Is shown in. In other embodiments, the forward link of system 200 may be the same as the IS-95 forward channel. In IS-95, multiple forward channels may be received by the mobile unit.

The forward link of system 200 is also different from IS-95 in that the pilot channel is burst transmitted and inserted into the data channel, as opposed to the pilot channel being continuously transmitted as in IS-95. Other overhead channels are also different: The IS-95 continuous sync and paging channels are coupled to a single control channel in the system 200, where the messages of the single control channel are multiplexed in time on the "single user" forward link. Multiplexing is desirable because it prevents base station power from splitting between two or more consecutively transmitted channels. Using nearly all of the power of the base station to transmit the data channel allows high data rates to be used.

System 200 is designed to operate on a separate CDMA channel (ie, a different frequency) rather than an existing IS-95 system. System 200 may be deployed independently of an existing IS-95 system (or may be located where such a system is not present) and in this case does not include interaction with the underlying voice system. Alternatively, the system 200 may be located at a location where an IS-95 system working together exists, in which case the IS-95 system associated with the information supports a system 200 control channel supporting handoff to the IS-95 system. Will be carried in the same manner, and likewise provides information transfer from IS-95 system to system 200 by call forward notification.

In system 200, an overhead channel such as a paging channel is multiplexed in time with the forward data channel, and if less time is needed to transmit the paging channel, more time is available to transmit the forward data channel. For a given constant data rate, it is highly desirable to reduce the amount of time spent transmitting the paging channel because the data throughput for the mobile unit is directly related to the amount of time that the forward data channel is sent and received by the mobile unit. desirable.

In TIA / EIA-95, the paging channel is transmitted continuously and occupies part of the total available bandwidth on the forward channel and the total available power of the base station. Since the total available power of some base stations is used by the paging channel, less power is used for the forward data channel. At a given signal to noise ratio (SNR) and a given bit error rate (BER), the maximum data rate on the forward data channel is a function of the power available to the forward data channel. In particular, in a given SNR, if less power is used for the forward data channel, the maximum data rate on the forward data channel must be reduced to meet the requirements for a given BER.

In many systems and applications that require high data rates, it may not be possible to use more power in the forward data channel by increasing the power at the base station transmitter. Thus, to obtain a high transmission data rate, it is necessary to occupy power from other channels and use that power in the forward data channel. Unfortunately, taking too much power from the paging channel to the forward data channel has a significant impact on the SNR on the paging channel, which in turn has a significant impact on the BER on the paging channel, making it possible to recognize the information transmitted over the paging channel. none. However, if it is not possible to increase transmitter power, it is necessary to significantly increase the power available for the forward data channel by taking a significant amount of power from the paging channel (or some other channel) to significantly increase the data transfer rate. There can be. To significantly increase the data transfer rate, it may be necessary to take all of the power from the paging channel and provide it to the forward data channel and multiplex the paging channel and the data channel in time. At a given transmitter power, a system in which the paging channel and data channel are multiplexed in time allows a higher transmission data rate to the user than a system in which the paging channel and data channel are simultaneously transmitted and share a predetermined transmit power.

While it is true that higher maximum transmission data rates are possible when the paging channel and the forward data channel are multiplexed in time, the time spent transmitting the paging channel to obtain a high effective transmission data rate should be minimized as suggested in the following equation. do.

Effective transmit data rate = Tr _Max * Tfd (Tfd + Tpc), where Tr _Max is the maximum transmit data rate, Tfd is the transmission period of the forward data channel for one period, and Tpc is the transmission period of the paging channel for one period .

2 shows the structure of a forward link of an embodiment according to the invention. The forward link is a periodic cycle of a data stream that includes a paging channel multiplexed with the forward data channel. The paging channel includes a signature capsule and an overhead message capsule. In the embodiment shown in Figure 2, the signature and overhead message capsules are sent in cycles with a duration of 400 milliseconds. In alternative embodiments, the cycle has a different duration. The signature capsule includes at least one signature. The signature may indicate only one overhead message or may indicate one or more message groups (ie, the signature is changed when at least one message is changed in one or more message groups).

The overhead message capsule includes at least one overhead message. The overhead message is not addressed to a specific mobile unit but rather to distribute to each mobile unit in the corresponding coverage area. Possible overhead messages include system parameters, access parameters, channel list and neighbor list overhead messages. Each type of overhead message must be broadcast at least once per second. In a preferred embodiment, the message is broadcast every 400 milliseconds. For example, the neighbor list overhead message continuously broadcasts a list of neighbor base stations from which communication may be possible. The mobile unit uses the neighbor list to monitor the signal from the neighbor base station when the mobile unit enters the coverage area of the neighbor base station. Cellular systems may have other types of overhead messages. It is known that overhead messages can include many different parameters needed to establish and maintain communication between the mobile unit and the base station.

Overhead messages or messages are generally received and processed by the mobile unit when the mobile unit is not or is about to be associated with the call (ie, "idle state"). The term idle state is a slightly different concept because the mobile unit can be very busy even in the idle state. During the idle state, the mobile station wakes up periodically and listens to the paging channel to process messages on the channel. The overhead message may remain the same for the next time period in which the mobile station wakes up periodically and listens to the paging channel. Since the mobile unit wakes up only to determine if the overhead message is the same as the previously decoded previous message, and receiving and decoding the overhead message is undesirable in terms of battery power conservation, the sequence number is associated with the overhead message. Are sent together. When the mobile unit wakes up, the mobile unit receives a signature of an overhead message to be received later, and decides to go to a wake up state and receive the overhead message. In many cases, the mobile unit goes back to sleep mode after receiving the signature because the signature is the same as the sequence number received at the last time the mobile unit waked up. Since listening to overhead messages requires a certain amount of power and the listening function is performed frequently (about once per second), limiting the time the mobile unit performs the listening function reduces the overall power consumption of the mobile unit. This increases the life of the battery or other power storage system used by the mobile unit. In many cases, overhead messages can remain the same for significant periods of time, which can result in significant power savings.

3 shows a process for updating an overhead message for an embodiment according to the present invention having a forward link of the structure shown in FIG. Referring to FIG. 3, in step 302 the overhead message is modified at BS 210. In step 304, a signature for the changed overhead message is generated at BS 210. The signature can be generated by hashing the message using a known hashing function to generate a 16 or 32 bit signature. Hashing a message to generate a signature may be performed by a signature generator using known mathematical logic (not shown) or a general purpose microprocessor (not shown) and will not be described in detail herein. Those skilled in the art will appreciate that a signature may be generated using other forms of logic not described herein. The bit length of the signature is in accordance with system requirements such that two consecutive messages share different signatures (ie, avoid collisions). There is a limited but small possibility that two different consecutive messages can share the same signature, since hashing only serves to compress the message space into a small signature space where more than one message can have the same signature. If the two consecutive messages are different but the hashing produces the same signature for both, then at step 304, the hashing can be repeated at random until a signature is generated that is different from the signature of the preset number of previous messages. Alternatively, the signature can be generated by incrementing the counter.

In step 306, the MU 202 wakes up and listens. At step 308, BS 210 sends a signature to MU 202. In step 310, the MU 202 receives a signature. In step 312, MU 202 retrieves the previous signature from memory (not shown). In step 312, the MU 202 compares the previous signature with the signature received in step 310. The circuit or signature comparison element required to perform the comparison in step 312 may be implemented by various components, including microprocessors, complex logic, and other logic circuits. If the signature received in step 310 is the same as the previous signature, then in step 314 the MU 202 returns to sleep mode. If the signature received in step 310 is different than the previous signature, then in step 316 the MU 202 stays awake and listens to receive the message. After the MU 202 receives the message, the MU 202 may update the operating parameters of the MT 204 to efficiently communicate with the system 200.

The structure of the overhead message on the paging channel may be in accordance with the structure required by a technique known as slotted paging. Slotted paging is useful to reduce power consumption by mobile units. Information on slot mode operation is disclosed in US Pat. No. 5,392,287, entitled "Devices and Methods for Reducing Power Consumption in Mobile Communication Receivers," issued February 21, 1995, which is assigned to the assignee of the present invention and referenced herein. do.

4 shows the structure of a forward link of another embodiment according to the present invention. The forward link is a periodic cycle of a data stream that includes a paging channel multiplexed with the forward data channel. The paging channel includes an overhead message capsule. In the embodiment shown in Figure 4, the overhead message capsule is sent in a cycle having a duration of 400 milliseconds. In other embodiments, the period may have a different duration.

5 shows a process for updating an overhead message for another embodiment according to the present invention having a forward link of the structure shown in FIG. Referring to FIG. 5, in step 502 the overhead message is changed at BS 210. In step 504, MU 202 wakes up and listens. In step 506, the BS sends a message to the MU 202 and the MU 202 receives the message. In step 508 the MU 202 generates a signature for the message using a hashing function as described for the process 300 of FIG. Hashing a message to generate a signature may be performed by a signature generator using known mathematical logic (not shown) or a general purpose microprocessor (not shown) and will not be described in detail herein. Those skilled in the art will appreciate that a signature may be generated using other forms of logic not described herein. In step 512, the MU 202 retrieves the previous signature from the storage (not shown) of the MU 202. In step 512, the MU 202 compares the previous signature with the signature generated in step 508. The circuit or signature comparison element required to perform the comparison in step 512 may be implemented by various components, including microprocessors, complex logic, and other logic circuits. If the signature generated in step 508 is the same as the previous signature, then in step 514 the MU 202 returns to sleep mode. If the signature generated in step 508 is different from the previous signature, then in step 516 the MU 202 updates the operating parameters with the information contained in the message received in step 506.

The generation and reception of CDMA signals are described in US Pat. No. 4,901,307, "Spread Spectrum Multiple Access Communication Systems Using Satellite or Terrestrial Repeaters," and US Pat. No. 5,103,459, "Systems and Methods for Generating Waveforms in CDMA Cellular Telephone Systems." The patent is assigned to the assignee of the present invention and is incorporated herein by reference.

Demodulation of multiple signals is described in US Pat. No. 5,490,165, "Assignment of Demodulation Elements in Systems Capable of Receiving Multiple Signals," and US Pat. No. 5,109,390, "Diversity Receivers in CDMA Cellular Telephone Systems." Has been transferred and is referred to here.

Although described with reference to specific embodiments of the present invention, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the scope and spirit of the invention. The invention is not limited by the foregoing description but is defined by the appended claims.

The present invention has the effect of delivering overhead messages, minimizing power consumption and reducing bandwidth in a wireless communication system providing access to a distributed network.

Claims (108)

A method of delivering a message to a mobile station by a wireless communication system providing access to a distributed data network, the method comprising: Providing a message sequence at a base station; Providing a separate signature for each individual message at the base station; And Comparing at least one signature with an individual signature for a predetermined individual message at the mobile station. 2. The method of claim 1, further comprising receiving a separate signature for the respective message at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature for the respective message at the mobile station; And Entering a sleep mode after receiving the signature at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature for the respective message at the mobile station; And Entering a sleep mode if the individual signature matches a corresponding signature from the at least one signature after receiving the individual signature at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature for the respective message at the mobile station; Entering a sleep mode after receiving the individual signature at the mobile station if the individual signature matches a corresponding signature from the at least one signature; And Sending the individual message at the base station, wherein a sleep mode occurs at the mobile station while the individual message is being transmitted. 2. The method of claim 1, further comprising: receiving a separate signature for each of the individual messages at the mobile station; And In the mobile station, entering a sleep mode if each respective signature matches a corresponding signature from the at least one signature. 2. The method of claim 1, further comprising: receiving a separate signature for each of the individual messages at the mobile station; And Entering a sleep mode at the mobile station if each respective signature matches a corresponding signature from the at least one signature; And Sending the respective individual messages at the base station, wherein a sleep mode occurs at the mobile station while each individual message is being transmitted. 2. The method of claim 1, further comprising: receiving a separate signature for the respective message at the mobile station; And Listening at the mobile station for the individual message if the individual signature does not match a corresponding signature from the at least one signature. 2. The method of claim 1, further comprising: receiving a separate signature for the respective message at the mobile station; And Listening to the respective message at the mobile station if the respective signature does not match a corresponding signature from the at least one signature, And said listening is made only until said individual message is received. 2. The method of claim 1, further comprising: receiving a separate signature for the respective message at the mobile station; And Listening to the individual message only until the respective message is received if the individual signature does not match a corresponding signature from the at least one signature at the mobile station; And Entering a sleep mode after the individual message is received at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature for the respective message at the mobile station; And Listening to the respective message at the mobile station if the respective signature does not match a corresponding signature from the at least one signature; Entering a sleep mode after the individual message is received at the mobile station; And And waking up after the sleep mode at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature for the respective message at the mobile station; And Listening to the respective message at the mobile station if the respective signature does not match a corresponding signature from the at least one signature; Entering a sleep mode after the individual message is received at the mobile station; And Waking up after a 5.2 second sleep mode at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature for the respective message at the mobile station; And Listening to the respective message at the mobile station if the respective signature does not match a corresponding signature from the at least one signature; And Entering a sleep mode after the individual message is received at the mobile station. 2. The method of claim 1, further comprising receiving a separate signature for each of the individual messages at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature for each of the individual messages at the mobile station; And Listening at the mobile station for an individual message where the individual signature does not match a corresponding signature from the at least one signature. 2. The method of claim 1, further comprising: receiving a separate signature for each of the individual messages at the mobile station; And Listening at the mobile station for an individual message where the individual signature does not match a corresponding signature from the at least one signature; And said listening is made only until said individual message is received. 2. The method of claim 1, further comprising: receiving a separate signature for each of the individual messages at the mobile station; Listening at the mobile station for an individual message where the individual signature does not match a corresponding signature from the at least one signature; And Entering a sleep mode after the individual message is received at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature for each of the individual messages at the mobile station; Listening at the mobile station for an individual message until the individual message is received, wherein the individual message does not match a corresponding signature from the at least one signature; And And entering a sleep mode for 5.2 seconds after the individual message is received at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature for each of the individual messages at the mobile station; Listening at the mobile station for an individual message until the individual message is received, wherein the individual message does not match a corresponding signature from the at least one signature; Entering a sleep mode after the individual message is received at the mobile station; And And waking up after the sleep mode at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature for each of the individual messages at the mobile station; Listening at the mobile station for an individual message until the individual message is received, wherein the individual message does not match a corresponding signature from the at least one signature; Entering a sleep mode after the individual message is received at the mobile station; And Waking up after a 5.2 second sleep mode at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature for each of the individual messages at the mobile station; Listening at the mobile station for an individual message until the individual message is received, wherein the individual message does not match a corresponding signature from the at least one signature; Entering a sleep mode after the individual message is received at the mobile station; And And waking up after the sleep mode at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature for each of the individual messages at the mobile station; Listening at the mobile station for an individual message until the individual message is received, wherein the individual message does not match a corresponding signature from the at least one signature; Entering a sleep mode after the individual message is received at the mobile station; And Waking up after a 5.2 second sleep mode at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature at the mobile station for each respective message sent by the wireless communication system; Listening to an individual message sent by the wireless communication system only until the individual message is received at the mobile station, wherein the individual signature does not match a corresponding signature from the at least one signature; Entering a sleep mode after the individual message is received at the mobile station; And And waking up after the sleep mode at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature at the mobile station for each respective message sent by the wireless communication system; Listening to an individual message sent by the wireless communication system only until the individual message is received at the mobile station, wherein the individual signature does not match a corresponding signature from the at least one signature; Entering a sleep mode after the individual message is received at the mobile station; And Waking up after a 5.2 second sleep mode at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature for each of the individual messages at the mobile station; Listening at the mobile station for a first individual message where a respective signature does not match a corresponding signature from the at least one signature; And Listening at the mobile station for a second separate message for which the individual signature does not match a corresponding signature from the at least one signature; The listening is made until the second individual message is received at the mobile station, and the second individual message listening occurs after listening to the first individual message. 2. The method of claim 1, further comprising: receiving a separate signature for each of the individual messages at the mobile station; Listening at the mobile station for a first individual message where a respective signature does not match a corresponding signature from the at least one signature; After listening to the first individual message, listening for a second individual message at the mobile station until the second individual message is received, where the individual signature does not match a corresponding signature from the at least one signature; And Entering a sleep mode after the second individual message is received at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature for each of the individual messages at the mobile station; Listening at the mobile station for a first individual message where a respective signature does not match a corresponding signature from the at least one signature; After listening to the first individual message, listening at the mobile station for a second individual message whose respective signature does not match a corresponding signature from the at least one signature; After listening to the second individual message, listening for a third individual message at the mobile station until the third individual message is received, where the individual signature does not match a corresponding signature from the at least one signature; And Entering a sleep mode after the third individual message is received at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature for each of the individual messages at the mobile station; The mobile station listens to each individual message for which the individual signature does not match the corresponding signature from the at least one signature, and there will no longer be a message for which the individual signature does not match the corresponding signature from the at least one signature. If the listening is stopped; And And entering a sleep mode after the listening stop at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature for each of the individual messages at the mobile station; The mobile station listens to each individual message for which the individual signature does not match the corresponding signature from the at least one signature, and there will no longer be a message for which the individual signature does not match the corresponding signature from the at least one signature. If the listening is stopped; Entering a sleep mode after the listening stops; And And waking up after said sleep mode. 2. The method of claim 1, further comprising: receiving a separate signature for each of the respective messages; When each individual message does not match a corresponding signature from the at least one signature, and there is no longer a message where the individual signature does not match a corresponding signature from the at least one signature. Stopping the listening; Entering a sleep mode after the listening stop at the mobile station; And And waking up at the mobile station for 5.2 seconds after the sleep mode. 2. The method of claim 1, further comprising: receiving a separate signature at the mobile station for each respective message sent by the wireless communication system; The individual signature does not match the corresponding signature from the at least one signature and the respective mobile station listens to each individual message sent by the wireless communication system and the individual signature does not match the corresponding signature from the at least one signature. Stopping the listening when the message no longer exists; Entering a sleep mode after the listening stop at the mobile station; And And waking up after the sleep mode at the mobile station. 2. The method of claim 1, further comprising: receiving a separate signature at the mobile station for each respective message sent by the wireless communication system; The individual signature does not match the corresponding signature from the at least one signature and the mobile station listens to each individual message sent by the wireless communication system, and the individual signature does not match the corresponding signature from the at least one signature. Stopping the listening when the message no longer exists; Entering a sleep mode after the listening stop at the mobile station; And And waking up at the mobile station for 5.2 seconds after the sleep mode. 2. The method of claim 1, further comprising: waking up at the mobile station; And Receiving a separate signature for the respective message at the mobile station. 2. The method of claim 1, further comprising: waking up at the mobile station; Receiving a separate signature for the respective message at the mobile station; And Listening to the individual message at the mobile station if the individual signature does not match a corresponding signature from the at least one signature, And said listening is made only until said individual message is received at said mobile station. 2. The method of claim 1, further comprising: waking up at the mobile station; Receiving a separate signature for the respective message at the mobile station; Listening to the individual message only until the individual message is received at the mobile station if the individual signature does not match a corresponding signature from the at least one signature; And Entering a sleep mode after the individual message is received at the mobile station. 2. The method of claim 1, further comprising: waking up at the mobile station; Receiving a separate signature for each of the respective messages at the mobile station; Listening only to the mobile station until the respective message is received, wherein the respective message does not match a corresponding signature from the at least one signature; And Entering a sleep mode after the individual message is received at the mobile station. 2. The method of claim 1, further comprising: waking up at the mobile station; Receiving a separate signature for each of the respective messages at the mobile station; The mobile station listens to each individual message for which the individual signature does not match the corresponding signature from the at least one signature, and there is no longer a message for which the individual signature does not match the corresponding signature from the at least one signature. If not, the listening is stopped; And And entering a sleep mode after the listening stop at the mobile station. 2. The method of claim 1, wherein said message sequence is an overhead message sequence. 2. The method of claim 1, wherein said message sequence is transmitted periodically by said wireless communication system. 2. The method of claim 1, wherein said message sequence is transmitted aperiodically by said wireless communication system. 2. The method of claim 1, wherein the message sequence is sent to at least one mobile station. 2. The method of claim 1, wherein each message is inserted into a message capsule having a plurality of messages. 2. The method of claim 1, wherein providing a separate signature for each respective message at the base station comprises hashing each message. 2. The method of claim 1, wherein providing a separate signature for each respective message at the base station comprises hashing each message to generate a first hash, wherein the hashing step comprises: Rehashing the predetermined message if the first hash matches one of at least one corresponding signature from the at least one signature, wherein the at least one corresponding signature is associated with each message. A method for delivering a message to a mobile station, characterized in that it is generated within a time period T _Delta before providing an individual signature. 2. The method of claim 1, wherein providing a separate signature for each respective message at the base station comprises hashing each message to generate a first hash, wherein the hashing step comprises the first message of a predetermined message. Adding a random value to the first hash if the hash matches one of the at least one corresponding signature from the at least one signature, the at least one corresponding signature assigning a respective signature to each message. A method for delivering a message to a mobile station, characterized in that it is generated within a time period T _Delta before providing. 2. The method of claim 1, wherein providing a separate signature for each respective message at the base station comprises hashing each message to generate a first hash, wherein the hashing step includes a first hash of a predetermined message. Rehashing a predetermined message with a random value when a match with one of at least one corresponding signature from the at least one signature, wherein the at least one corresponding signature provides a separate signature for each message. Before the message is generated in a time period T _Delta . 2. The method of claim 1, wherein providing a separate signature for each respective message at the base station comprises hashing each message to generate a first hash, wherein the hashing step includes a first hash of a predetermined message. Rehashing a predetermined message with a random value when a match with one of at least one corresponding signature from the at least one signature, wherein the at least one corresponding signature provides a separate signature for each message. to the time period the time period T, is produced in the prior _{Delta Delta} T is how to deliver the message to the mobile station, characterized in that is longer than the maximum allowable slip time of a given mobile station communicating with the wireless communication system. 2. The message of claim 1, wherein providing a separate signature for each respective message at the base station comprises hashing each message to generate a 16-bit value for the respective signature. How to pass it. 2. The message of claim 1, wherein providing a separate signature for each respective message at the base station comprises hashing each message to generate a 32-bit value for the respective signature. How to pass it. 2. The method of claim 1, wherein providing a separate signature for each respective message at the base station comprises providing a value stored in a counter to the individual signature. The method of claim 1, wherein providing a respective signature to each respective message at the base station comprises: Incrementing the counter; And Providing a value stored in the counter to the individual signature. The method of claim 1, wherein providing a respective signature to each respective message at the base station comprises: Incrementing a counter if the predetermined message does not match a corresponding first message that occurred at a predetermined time before providing the message sequence; And Providing a value stored in the counter to the individual signature. 2. The method of claim 1, wherein one of the message sequences includes an overhead message indicative of base station parameters in the wireless communication system. The method of claim 1, wherein one of the message sequences includes an overhead message indicating a base station parameter in the wireless communication system, the base station parameter comprising a system parameter, an access parameter, a channel list, and a neighbor list parameter. Delivering a message to a mobile station. 2. The method of claim 1, wherein one of the message sequences includes an overhead message indicative of a system wide parameter of the wireless communication system. 2. The method of claim 1, wherein one of the message sequences includes an overhead message indicating a system wide parameter of the wireless communication system, wherein the system wide parameter includes a system parameter, an access parameter, a channel list, and a neighbor list parameter. Characterized in that it is a method for delivering a message to a mobile station. 2. The method of claim 1, further comprising receiving the message sequence at the mobile station. 2. The method of claim 1, further comprising receiving the message sequence at the mobile station, wherein providing a separate signature for each respective message comprises hashing the respective message at the mobile station. Method for delivering a message to a mobile station. 2. The method of claim 1, further comprising receiving one of the message sequences at the mobile station, Providing a separate signature for each respective message comprises hashing the respective message at the mobile station to generate a first hash for the respective message, The hashing step includes rehashing the predetermined message using a random value if the first hash of the predetermined message matches one of the at least one corresponding signature from the at least one signature, Wherein said at least one corresponding signature is generated within a time period T _Delta prior to providing a separate signature to each of said messages. 2. The method of claim 1, further comprising receiving one of the message sequences at the mobile station, Providing a separate signature for each respective message comprises hashing the respective message at the mobile station to generate a first hash for the respective message, The hashing step includes rehashing the predetermined message using a random value if the first hash of the predetermined message matches one of the at least one corresponding signature from the at least one signature, The at least one corresponding signature is generated within a time period T _Delta prior to providing a separate signature for each message, And the time period T _Delta is longer than a maximum allowable sleep time of a given mobile station communicating with the wireless communication system. 2. The method of claim 1, further comprising: providing at least one stored message at the mobile station; And Receiving the message sequence at the mobile station, wherein each of the at least one stored message has a message corresponding to the message result, and providing a separate signature to each individual message is to each message. Hashing each message to generate a first hash for the message, wherein the hashing step is random if the first hash of a message matches one of at least one corresponding signature from the at least one signature. Rehashing the predetermined message using a value, wherein the at least one corresponding signature is generated within a time period T _Delta prior to providing an individual signature to each of the messages, wherein the time period T _Delta is generated. Longer than the maximum allowable sleep time of a given mobile station in communication with the wireless communication system, If the respective signature of the corresponding message does not match a corresponding signature from the at least one signature, replace the message from the at least one stored message with the corresponding message from the message sequence received at the mobile station. And sending the message to the mobile station. 2. The method of claim 1, further comprising: providing at least one stored message at the mobile station; And Receiving the message sequence at the mobile station, wherein each of the at least one stored message has a message corresponding to the message sequence, If the respective signature of the corresponding message does not match a corresponding signature from the at least one signature, replace the message from the at least one stored message with the corresponding message from the message sequence received at the mobile station. And sending the message to the mobile station. A wireless communication method in a base station, Sending a message capsule over a forward channel; Generating a signature for the message capsule; And Transmitting the signature over the forward channel to a separate signature capsule. As a wireless communication method in a mobile station, Receiving a signature associated with the message capsule in a message capsule and a separate signature capsule over a forward channel; And Comparing the signature with one or more signatures previously stored in the mobile station. As a wireless communication method in a mobile station, Receiving a message capsule over a forward channel; Calculating a signature from the message capsule; And Comparing the signature with one or more signatures previously stored in the mobile station. A device suitable for wireless communication, Send a message capsule over a forward channel; Generate a signature for the message capsule; And a base station configured to transmit the signature on a separate signature capsule over the forward channel. A device suitable for wireless communication, Receive a signature in a message capsule and an individual signature capsule over a forward channel, the signature being associated with the message capsule; And the mobile station configured to compare the signature with one or more signatures previously stored in the mobile station. 68. The apparatus of claim 67, wherein said message capsule comprises at least one overhead message and said signature is associated with at least one overhead message. 68. The apparatus of claim 67, wherein the mobile station is configured to enter a sleep mode if the signature matches one of the pre-stored signatures. 70. The apparatus of claim 69, wherein the mobile station is configured to listen to the message capsule if the signature does not match one of the pre-stored signatures. 71. The apparatus of claim 70, wherein the mobile station is configured to listen only until the message capsule is received. 68. The apparatus of claim 67, wherein said message capsule is one of a sequence of message capsules carrying an overhead message. 73. The apparatus of claim 72, wherein the sequence is transmitted periodically. 73. The apparatus of claim 72, wherein the sequence is transmitted aperiodically. 68. The apparatus of claim 67, wherein the signature is generated by hashing the message capsule. 76. The method of claim 75, wherein the hashing comprises hashing the first message capsule to generate a first hash, and rehashing the message capsule if the first hash of the message matches the signature of a previous message capsule. Apparatus suitable for wireless communication, characterized in that. 77. The apparatus of claim 76, wherein said rehashing comprises adding a random value to said first hash. 77. The apparatus of claim 76, wherein said rehashing occurs when a signature of said previous message capsule is generated within a time period T _Delta . 76. The apparatus of claim 75, wherein the hashing is arranged to generate one of a 16 bit value and a 32 bit value for the signature. 68. The apparatus of claim 67, wherein the signature is generated by assigning a value stored in a counter. 81. The apparatus of claim 80, wherein the counter is incremented after the signature is generated. 84. The apparatus of claim 81, wherein the counter is incremented when the message capsule is different from a previously sent message capsule. 68. The apparatus of claim 67, wherein the message capsule comprises an overhead message. 84. The apparatus of claim 83, wherein the overhead message indicates a system parameter, an access parameter, a channel list, and a neighbor list parameter. A device suitable for wireless communication, Receive a message capsule over a forward channel; Generate a signature from the message capsule; And the mobile station configured to compare the signature with one or more signatures previously stored in the mobile station. 86. The apparatus of claim 85, wherein the mobile station is configured to enter a sleep mode if the signature matches one of the pre-stored signatures. 86. The apparatus of claim 85, wherein the mobile station is configured to listen to the message capsule if the signature does not match one of the pre-stored signatures. 88. The apparatus of claim 87, wherein the mobile station is configured to listen only until the message capsule is received. 88. The apparatus of claim 87, wherein the mobile station is configured to stop the listening when there is no longer a message capsule whose signature does not match one of the pre-stored signatures. 86. The apparatus of claim 85, wherein the message capsule is one of a sequence of message capsules carrying an overhead message. 91. The apparatus of claim 90, wherein the sequence is transmitted periodically. 93. The apparatus of claim 90, wherein the sequence is transmitted aperiodically. 86. The apparatus of claim 85, wherein the signature is generated by hashing the message capsule. 94. The method of claim 93, wherein the hashing comprises hashing the first message capsule to generate a first hash, and rehashing the message capsule if the first hash of the message matches a signature of a previous message capsule. Apparatus suitable for wireless communication, characterized in that. 95. The apparatus of claim 94, wherein said rehashing comprises adding a random value to said first hash. 95. The apparatus of claim 94, wherein the rehashing occurs when a signature of the previous message capsule is generated within a time period T _Delta . 100. The apparatus of claim 96, wherein the time period T _Delta is longer than a maximum allowable sleep time of a given mobile station communicating with a wireless communication system. 95. The apparatus of claim 94, wherein the hashing is arranged to generate one of a 16 bit value and a 32 bit value for the signature. 95. The apparatus of claim 94, wherein the signature is generated by assigning a value stored in a counter. 107. The apparatus of claim 99, wherein the counter is incremented after the signature is generated. 107. The apparatus of claim 99, wherein the counter is incremented if the message capsule is different from a previously sent message capsule. 86. The apparatus of claim 85, wherein the message capsule comprises at least one overhead message, and wherein the signature is associated with the at least one overhead message. 107. The apparatus of claim 102, wherein the at least one overhead message indicates a system parameter, an access parameter, a channel list, and a neighbor list parameter. A mobile station apparatus for receiving a message from a base station, comprising: Means for receiving a message capsule; Means for generating a signature corresponding to the message capsule; And Means for comparing the signature with at least one signature previously stored. A base station apparatus for delivering a message to a mobile station, Means for sending a message capsule over a forward channel; Means for generating a signature for the message capsule; And Means for transmitting the signature over the forward channel to a separate signature capsule. 66. A computer readable storage medium having stored thereon a computer program comprising instructions executable for performing the method of any one of claims 63-65. 107. The mobile station apparatus of claim 104, wherein the apparatus is implemented as a computer readable storage medium storing a computer program. 107. The base station apparatus as claimed in claim 105, wherein the apparatus is implemented as a computer readable storage medium storing a computer program.

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