KR20020013264A - Overhead message update with decentralized control - Google Patents

Abstract

PURPOSE: An overhead message update by distributed control is provided to minimize power consumption and save a bandwidth by performing a communication of an overhead message in a wireless communication system for providing an access as to a distributed network. CONSTITUTION: An overhead message is changed in a BS(Base Station)(302). A signature about the changed overhead message is generated in the BS(304). An MU(Mobile Unit) wakes up and listens(306). The BS transmits the signature to the MU(308). The MU receives the signature(310). The MU retrieves a previous signature from a memory(312). The MU compares the received signature with the previous signature(312). If the received signature is different from the previous signature, the MU maintains the wake state, and listens for receiving a message(316). The MU changes an operation parameter for efficiently communicating with a system.

Description

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

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 providing communication services to the mobile unit as the mobile station moves from unit to unit. The BSC is then connected to several mobile switching centers (MSCs), which are telephone exchanges with special software to handle 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 call modes from fixed telephones.

The mobile unit is ultimately connected to the MSC via an over-the air radio frequency (RF) reverse link (mobile unit to BS) link and RF forward (BS to mobile unit) link. RF signals are exchanged between each mobile unit and one or more base stations via these links. Mobile units do not communicate directly with each other. Mobile unit to mobile unit communication between the distances of one or more cells occurs through a base station that provides service to the mobile unit with which it wishes to communicate. The base station communicates with the BSC through various media such as 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 use a variety of techniques to allow users to use a single communication channel that occupies a limited frequency range. Code Division Multiple Access (CDMA) is one such technique. Preferred CDMA standards are shown in the TIA / EIA standard TIA / EIA-95-B entitled "Mobile Station-Base Station Compatibility Standard for Dual Mode Wideband Spread Spectrum 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 CDMA Principles of Edison-Wesley Publishing Company, Reading, Andrew J. Viterbi, Spread Spectrum Communications , Massachusetts. In contrast to CDMA, two other multiple access techniques are adjusting user transmission timing (time division multiple access (TDMA)) or adjusting part of a user communication channel (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 (typically telephone 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 required to send overhead messages. The overhead message contains information that enables mobile unit to base station communication.

The overhead message is not for any particular mobile unit but for distribution to each mobile unit in the corresponding coverage area. There are four types of overhead messages in an IS-95CDMA 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 attempts 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 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 and receives the overhead message and decodes it to determine that the overhead message is the same as the previously decoded previous message, it is not desirable in terms of battery power conservation. Is sent along. 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 goes back 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 that the mobile unit performs the listening function reduces the overall power consumption of the mobile unit and thus Increase 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 BSM. The reason for this central control is due to the nature of the services typically provided by cellular systems. Cellular systems generally provide connectivity with voice services or terrestrial PSTNs. In general, PSTNs have a highly concentrated exchange structure. As a result, cellular systems that wish to interface with the PSTN must use a central switching center 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, such central location can be remotely controlled to control programming of the overhead message and sequence number 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. 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 e-mail (electronic messaging), file transfer protocol (file transfer), 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. Routers break messages into smaller pieces called packets. Packets are sent separately 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 packet's destination address but does not examine its contents and determine the best path.

In general, routers connect directly to a distributed network and generally transmit data along multiple paths, so it is often not necessary to switch from a central location to form a single path to the destination. Thus, 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 update 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.

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

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 in a wireless communication system according to the present invention.

3 illustrates a process for communicating overhead messages using the structure of the forward link shown in FIG.

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

FIG. 5 illustrates an alternative process for communicating 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

In one embodiment, a wireless base station connected to a distributed network sends a server sequence for overhead messages to the mobile unit. The waked up mobile unit receives 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 a number of 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, the mobile unit 202 can communicate wirelessly.

An MU is a constituent entity consisting of a terminal device and a mobile termination. In this description, the term "mobile unit" refers to a remote subscriber station for explanation. However, the mobile unit may be fixed. The mobile unit can be part of a multi-user distributed subscriber system. The mobile unit can be used to transmit voice, data or their combined signal types. The term "mobile unit" is a general 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 LANtop or notebook computer or a personal digital assistant (PDA). TE 206 is coupled to MT 204, which is a wireless device that modulates and demodulates data. The BTS 214 is connected to the MT 204 via an air interface of radio frequencies (RF). BTS 214 provides data modulation and demodulation capabilities for connecting to MT 206. RSMs 214 and 224 act as radio link protocol (RLP) endpoints and signaling endpoints and map Internet protocol addresses and mobile station IDs 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 that is 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 BTS 212 and the MT 204 includes a forward link for communication of the BTS to the mobile unit and a reverse link for communication of the mobile unit to the BTS. In one embodiment, the forward link of the system 200 is entirely assigned to a single mobile unit at a given moment, or only a single forward channel is transmitted 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 shown in the TIA / EIA standard TIA / EIA-95-B entitled "Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Systems". In alternative embodiments, the forward link of system 200 may be the same as the IS-95 forward channel. In IS-95, multiple forward channels can be received by the mobile unit.

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

System 200 is designed to operate on a separate CDMA channel (ie, a different frequency) than the current IS-95 system. The system 200 may be deployed independently of the current IS-95 system (or may be located without such a system), in which case it does not interact with the basic voice system. Alternatively, the system 200 may be located in 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 conveyed from the IS-95 system to the system 200 by call transfer 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 spent transmitting the paging channel, more time is available to transmit the forward data channel. For a given constant data rate, it is desirable to reduce the amount of time used to transmit a paging channel because the data throughput for the mobile unit has a direct relationship with the amount of time that the forward data channel is sent and received by the mobile unit. do.

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 transfer rate on the forward data channel is a function of the power available to the forward data channel. In particular, for a given SNR, if less power is used for the forward data channel, then 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 rate, it is necessary to occupy power from other channels and use that power for 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, thus recognizing the information transmitted over the paging channel. Can't. 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 transmission rate. There can be. In order to significantly increase the data transfer rate, it may be necessary to take all 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 for the user than a system in which the paging channel and data channel are simultaneously transmitted and share a predetermined transmission power.

While it is true that high 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. .

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 FIG. 2, the signature and overhead message capsules are sent in cycles with a duration of 400 milliseconds. In alternative embodiments, the period has a different period. 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 about a specific mobile unit but 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 going 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 and receives the overhead message and decodes it to determine that the overhead message is the same as the previously decoded previous message, it is not desirable in terms of battery power conservation. Is sent along. When the mobile unit wakes up, the mobile unit receives the signature of the overhead message to be received later and decides to wake up 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 was woken 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 that the mobile unit performs the listening function reduces the overall power consumption of the mobile unit and thus Increase 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. In 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 and there is a known hashing function to generate a 16 or 32 bit signature. Hashing a message to generate a signature is 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 here. Those skilled in the art will appreciate that a signature may be generated using other forms of logic that are not signed here. 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 different signature occurs than the signature of the preset number of previous messages. Optionally, 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. If the signature received in step 310 is the same as the previous signature, then in step 314 the MU 202 goes back 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 allows the MT 204 to change operating parameters 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 for reducing 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 illustrates the structure of a forward link of an alternative 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 period having a period of 400 milliseconds. In alternative embodiments, the period may have another period.

5 shows a process for updating an overhead message for an alternative embodiment in accordance with the present invention having a forward link of the structure shown in FIG. In FIG. 5, in step 502 the overhead message is modified at BS 210. In step 504, the 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 MU 202 generates a signature for the message using a hashing function as described with respect to process 300 of FIG. Hashing a message to generate a signature is 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 here. Those skilled in the art will appreciate that a signature may be generated using other forms of logic that are not signed here. 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. If the signature generated at step 508 is the same as the previous signature, then at 514 the MU 202 goes back to sleep mode. If the signature generated in step 508 is different from the previous signature, then in step 416 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. 4,401,307, "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 communicating overhead messages, minimizing power consumption and reducing bandwidth in a wireless communication system providing access to a distributed network.

Claims (62)

A method of communicating messages to a mobile station by a wireless communication system providing access to a distributed data network, the method comprising: Providing a message sequence; Providing a respective signature for each message; And Comparing the at least one signature with each signature for a given message. 2. The method of claim 1, further comprising receiving a respective signature for each message. 2. The method of claim 1, further comprising: receiving a respective signature for each message; And And entering a sleep mode after receiving the signature. The method of claim 1, Receiving a respective signature for each message; And And entering a sleep mode after receiving each signature if each signature matches a corresponding signature from at least one signature. 2. The method of claim 1, further comprising: receiving a respective signature for each message; Entering a sleep mode after receiving each signature if each signature matches a corresponding signature from at least one signature; And Sending each message, wherein the sleep mode is generated while each message is being sent. The method of claim 1, Receiving a respective signature for each message; And And entering a sleep mode if each signature matches a corresponding signature from at least one signature. The method of claim 1, Receiving a respective signature for each message; And Entering a sleep mode if each signature matches a corresponding signature from at least one signature; And Sending each message, wherein the sleep mode is generated while each message is being sent. The method of claim 1, Receiving a respective signature for each message; And Listening to each message if each signature does not match a corresponding signature from at least one signature. The method of claim 1, Receiving a respective signature for each message; And Listening to each message if each signature does not match a corresponding signature from at least one signature, A method for communicating a message to a mobile station, characterized in that it is only listened until each message is received. The method of claim 1, Receiving a respective signature for each message; And Listening to each message only until each message is received if each signature does not match a corresponding signature from at least one signature; And And entering a sleep mode after each message has been received. The method of claim 1, Receiving a respective signature for each message; And Listening to each message if each signature does not match a corresponding signature from at least one signature; Entering a sleep mode after each message is received; And And waking up after a sleep mode. The method of claim 1, Receiving a respective signature for each message; And Listening to each message if each signature does not match a corresponding signature from at least one signature; Entering a sleep mode after each message is received; And And waking up after a sleep mode for 5.2 seconds. The method of claim 1, Receiving at the mobile station a respective signature for each message; And Listening to each message at the mobile station if each signature does not match a corresponding signature from at least one signature; And And entering a sleep mode at the mobile station after each message has been received. The method of claim 1, Receiving a respective signature for each message. The method of claim 1, Receiving a respective signature for each message; And Listening to each message where each signature does not match a corresponding signature from at least one signature. The method of claim 1, Receiving a respective signature for each message; And Listening to each message where each signature does not match a corresponding signature from at least one signature, A method for communicating a message to a mobile station, characterized in that it listens only until each message is received. The method of claim 1, Receiving a respective signature for each message; Listening to each message where each signature does not match a corresponding signature from at least one signature; And And entering a sleep mode after each message has been received. The method of claim 1, Receiving a respective signature for each message; Listening to each message only until each message is received, where each signature does not match a corresponding signature from at least one signature; And And entering a sleep mode for 5.2 seconds after each message has been received. The method of claim 1, Receiving a respective signature for each message; Listening to each message only until each message is received, where each signature does not match a corresponding signature from at least one signature; Entering a sleep mode after each message is received; And And waking up after the sleep mode. The method of claim 1, Receiving a respective signature for each message; Listening to each message only until each message is received, where each signature does not match a corresponding signature from at least one signature; Entering a sleep mode after each message is received; And And waking up after a sleep mode for 5.2 seconds. The method of claim 1, Receiving at the mobile station a respective signature for each message; Listening at the mobile station only until each message is received, each message in which each signature does not match a corresponding signature from at least one signature; Entering a sleep mode at the mobile station after each message is received; And And waking up at the mobile station after the sleep mode. The method of claim 1, Receiving at the mobile station a respective signature for each message; Listening at the mobile station only until each message is received, each message in which each signature does not match a corresponding signature from at least one signature; Entering a sleep mode at the mobile station after each message is received; And And waking up at the mobile station after a sleep mode for 5.2 seconds. The method of claim 1, Receiving at the mobile station a respective signature for each message sent by the wireless communication system; Listening at the mobile station until each message is received, each message sent by the wireless communication system where each signature does not match a corresponding signature from at least one signature; Entering a sleep mode at the mobile station after each message is received; And And waking up at the mobile station after the sleep mode. The method of claim 1, Receiving at the mobile station a respective signature for each message sent by the wireless communication system; Listening at the mobile station until each message is received, each message sent by the wireless communication system where each signature does not match a corresponding signature from at least one signature; Entering a sleep mode at the mobile station after each message is received; And And waking up at the mobile station after a sleep mode for 5.2 seconds. The method of claim 1, Receiving a respective signature for each message; Listening to each first message where each signature does not match a corresponding signature from at least one signature; And Listening to each second message where each signature does not match a corresponding signature from at least one signature, Listening is made until each second message is received, and each second message listening occurs after each first message listening. The method of claim 1, Receiving a respective signature for each message; Listening to each first message where each signature does not match a corresponding signature from at least one signature; Listening to each second message for which each signature does not match a corresponding signature from at least one signature, wherein listening is made until each second message is received and each second message is received. The listening occurs after each first message listening; And And entering a sleep mode after each second message has been received. The method of claim 1, Receiving a respective signature for each message; Listening to each first message where each signature does not match a corresponding signature from at least one signature; Listening to each second message where each signature does not match a corresponding signature from at least one signature, wherein each second message listening occurs after each first message listening; Listening to each third message where each signature does not match a corresponding signature from at least one signature, wherein each third message listening occurs after each second message listening, Three message listening is made until each third message is received; And And entering a sleep mode after each third message is received. The method of claim 1, Receiving a respective signature for each message; Listening to each message where each signature does not match a corresponding signature from at least one signature, wherein there is no longer a message where each signature does not match a corresponding signature from at least one signature. Otherwise stop listening; And And entering a sleep mode after interrupting the listening. The method of claim 1, Receiving a respective signature for each message; Listening to each message where each signature does not match a corresponding signature from at least one signature, wherein there is no longer a message where each signature does not match a corresponding signature from at least one signature. Otherwise stop listening; Entering a sleep mode after stopping listening; And And waking up after all of the sleeps. The method of claim 1, Receiving a respective signature for each message; Listening to each message where each signature does not match a corresponding signature from at least one signature, wherein there is no longer a message where each signature does not match a corresponding signature from at least one signature. Otherwise stop listening; Entering a sleep mode after stopping listening; And And waking up for 5.2 seconds after all of the sleeps. The method of claim 1, Receiving at the mobile station a respective signature for each message sent by the wireless communication system; Listening at the mobile station for each message where each signature does not match a corresponding signature from at least one signature, wherein the message no longer matches each signature with a corresponding signature from at least one signature. Stop listening if not present, each message being sent by a wireless communication system; Entering a sleep mode at the mobile station after stopping listening; And And waking up at the mobile station after all of the sleeps. The method of claim 1, Receiving at the mobile station a respective signature for each message sent by the wireless communication system; Listening at the mobile station for each message where each signature does not match a corresponding signature from at least one signature, wherein the message no longer matches each signature with a corresponding signature from at least one signature. Stop listening if not present, each message being sent by a wireless communication system; Entering a sleep mode at the mobile station after stopping listening; And And waking up at the mobile station for 5.2 seconds after all of the sleeps. The method of claim 1, Waking up the mobile station; And Receiving a respective signature for each message at the mobile station. The method of claim 1, Waking up the mobile station; Receiving a respective signature for each message at the mobile station; And Listening to each message at the mobile station if each signature does not match a corresponding signature from at least one signature, Listening is only performed until each message has been received. The method of claim 1, Waking up the mobile station; Receiving a respective signature for each message at the mobile station; Listening at the mobile station for each message if each signature does not match a corresponding signature from at least one signature, the listening being made only until each message is received; And And entering a sleep mode after each message has been received. The method of claim 1, Waking up the mobile station; Receiving a respective signature for each message at the mobile station; Listening at the mobile station for each message where each signature does not match a corresponding signature from at least one signature, the listening being made only until each message has been received; And And entering a sleep mode after each message has been received. The method of claim 1, Waking up the mobile station; Receiving a respective signature for each message at the mobile station; Listening at the mobile station for each message where each signature does not match a corresponding signature from at least one signature, wherein there is no longer a message where each signature does not match a corresponding signature from at least one signature. Otherwise, listening stops; And And entering a sleep mode at the mobile station after stopping listening. 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 said 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 each signature with each message comprises hashing each message. 2. The method of claim 1, wherein providing each signature for each message comprises hashing each message to generate a first hash, wherein the hashing comprises at least one signature of the first hash of a message. Rehashing a given message if it matches one of the at least one corresponding signature from the at least one corresponding signature, wherein the at least one corresponding signature is within a time period T _Delta prior to providing each signature to each message. A method for communicating a message to a mobile station, wherein the message is generated. 2. The method of claim 1, wherein providing each signature for each message comprises hashing each message to generate a first hash, wherein the hashing comprises at least one signature of the first hash of a message. Adding a random value to the first hash if it matches one of the at least one corresponding signature from the at least one corresponding signature, wherein the at least one corresponding signature is within a time period T _Delta prior to providing each signature to each message. A method for communicating a message to a mobile station, wherein the message is generated. 2. The method of claim 1, wherein providing each signature for each message comprises hashing each message to generate a first hash, wherein the hashing comprises at least one signature of the first hash of a message. Rehashing a predetermined message with a random value when matching one of the at least one corresponding signature from the at least one corresponding signature in a time period T _Delta before providing each signature to each message. And a message originating from the mobile station. 2. The method of claim 1, wherein providing each signature for each message comprises hashing each message to generate a first hash, wherein the hashing comprises at least one signature of the first hash of a message. Rehashing a predetermined message with a random value when matched with one of the at least one corresponding signature from the at least one corresponding signature in a time period T _Delta before providing each signature to each message. _{Wherein the} time period T _Delta is greater than a maximum allowable sleep time of a given mobile station communicating with the wireless communication system. 2. The method of claim 1, wherein providing each signature for each message comprises hashing each message to generate a 16-bit value for each signature. . 2. The method of claim 1, wherein providing each signature for each message comprises hashing each message to generate a 32-bit value for each signature. . 2. The method of claim 1, wherein providing each signature for each message comprises providing each signature with a value stored in a counter. The method of claim 1, wherein providing each signature with each message comprises: Incrementing the counter; And Providing a value stored in a counter to each signature. The method of claim 1, wherein providing each signature with each message comprises: Incrementing a counter if a predetermined message does not match a corresponding first message, the corresponding first message being generated at a predetermined time prior to providing the message sequence; And Providing a value stored in a counter to each signature. 2. The method of claim 1, wherein one of the sequence of messages includes an overhead message indicative of base station parameters in a wireless communication system. 2. The mobile station of claim 1, wherein one of the message sequences comprises an overhead message indicative of base station parameters in a wireless communication system, the base station parameters including system parameters, access parameters, channel list and neighbor list parameters. How to communicate messages. 10. 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. 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. Communicating a message to a mobile station. 2. The method of claim 1, further comprising receiving a message sequence at the mobile station. 2. The mobile station of claim 1, further comprising the step of receiving a message sequence at the mobile station, wherein providing each signature to each message comprises hashing each message at the mobile station. How to communicate a message. 2. The method of claim 1, further comprising receiving one of a sequence of messages at the mobile station, Providing each signature with each message includes hashing each message to generate a first hash for each 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, At least one corresponding signature is generated within a time period T _Delta prior to providing each signature with a respective message. 2. The method of claim 1, further comprising receiving one of a sequence of messages at the mobile station, Providing each signature with each message includes hashing each message to generate a first hash for each 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, At least one corresponding signature is generated within time period T _Delta before providing each signature with each message, Time period T _Delta is greater than a maximum allowable sleep time of a given mobile station communicating with the wireless communication system. The method of claim 1, Providing at least one stored message at the mobile station; Receiving a sequence of messages at the mobile station, wherein at least one each stored message has a message corresponding to the sequence of messages, and providing each signature with a respective signature comprises a first hash for each message. Hashing each message to generate a hashing step, wherein the hashing step returns a predetermined message using a random value if the first hash of the predetermined message matches one of at least one corresponding signature from at least one signature. Hashing, wherein at least one corresponding signature is generated within a time period T _Delta prior to providing each signature to each message, the time period T _Delta being the maximum allowed of any mobile station to communicate with the wireless communication system. Greater than sleep time; And If each signature of the corresponding message does not match a corresponding signature from at least one signature, replacing the message from the at least one stored message with the corresponding message from the message sequence received at the mobile station. And communicating a message to a mobile station. The method of claim 1, Providing at least one stored message at the mobile station; Receiving a message sequence at the mobile station, wherein at least one each stored message has a message corresponding to the message sequence; And If each signature of the corresponding message does not match a corresponding signature from at least one signature, replacing the message from the at least one stored message with the corresponding message from the message sequence received at the mobile station. And communicating a message to a mobile station.