WO2001010147A1 - Signalling method for a mobile telephone system - Google Patents
Signalling method for a mobile telephone system Download PDFInfo
- Publication number
- WO2001010147A1 WO2001010147A1 PCT/DE2000/002461 DE0002461W WO0110147A1 WO 2001010147 A1 WO2001010147 A1 WO 2001010147A1 DE 0002461 W DE0002461 W DE 0002461W WO 0110147 A1 WO0110147 A1 WO 0110147A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mobile radio
- radio system
- subset
- values
- frequency channel
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
Definitions
- the invention relates to a method, a base station and a subscriber station for signaling in a GSM mobile radio system.
- messages In mobile radio systems, messages (voice, picture information or other data) are transmitted via transmission channels with the help of electromagnetic waves (radio interface).
- the transmission takes place both in the downlink from the base station to the subscriber station and in the uplink from the subscriber station to the base station.
- Frequency Division Duplex FDD Frequency Division Duplex FDD
- transmission and reception take place in different, correspondingly separate frequency bands
- time division duplex Time Division Duplex TDD
- the two directions are separated by different time slots.
- time division multiplexing FDMA
- TDMA time slot multiplexing
- CDMA code division multiplexing
- TDD time division duplex
- DE 197 46 894 describes a transfer of a connection from a frequency channel of a GSM transmission to a frequency channel. known a TD-CDMA transmission.
- a complex signaling is required for a handover Zvi ⁇ rule different mobile radio systems.
- the object of the invention is to provide an improved signaling method, an improved base station and an improved subscriber station which enables an interaction between the existing GSM mobile radio system and future mobile radio systems. This object is achieved by the base station with the features of claim 8, the subscriber station with the features of claim 9 and the method with the features of claim 1. Advantageous developments of the invention are specified in the subclaims.
- a first frequency channel is available between the base station and the subscriber station for the transmission of signaling information.
- At least one element of a set of values is transmitted with the signaling information, a first subset of the set of values serving as frequency channel numbers for assigning frequency channels of the GSM mobile radio system.
- a second subset of the value set is used to signal additional control functions for the subscriber station that go beyond the assignment of the frequency channels of the GSM mobile radio system.
- the invention not only ensures the ability of the GSM mobile radio system to interact with future mobile radio systems, for example the UMTS (Universal Mobile Telecommunication System), but also the compatibility, since the existing signaling options in the GSM mobile radio system are used for a handover procedure or other control functions what a migration of the current GSM mobile radio system to future mobile radio systems stemen enables.
- Subscriber stations of the current GSM mobile radio system use the elements of the first subset of the set of values as frequency channel numbers for assigning frequency channels. In contrast, the elements of the second subset of the value set of subscriber stations of the current GSM mobile radio system are ignored.
- Multimode subscriber stations which support both the current GSM mobile radio system and future mobile radio systems, for example the W-CDMA (Wideband Code Division Multiple Access) system, can evaluate the signaling information of the elements of the second subset of the set of values. Future mobile radio systems have different coding and decoding principles. Multimode subscriber stations can also encode and decode system-specific signaling information of the future mobile radio systems and thus receive signaling information about the coding and decoding principle via the first or a second frequency channel, which are then evaluated together and implement the control function.
- W-CDMA Wideband Code Division Multiple Access
- the elements of the value set have so far only been used for addressing frequency channels of a GSM mobile radio system with a fixed duplex spacing.
- the elements of the second subset are misused by this previous function and used for other control functions. Addressing other mobile radio systems is therefore particularly advantageous to signal with the elements of the set of values.
- a protocol converter between a GSM mobile radio system and a UMTS mobile radio system can be implemented in a particularly simple manner.
- a possible transfer to the UMTS mobile radio system can be signaled to the subscriber station and, at the same time, the protocol for the transfer initiated or the protocol of the GSM mobile radio System Konver in the protocol of the UMTS mobile radio system ⁇ be advantage.
- some elements of the second subset of the set of values can remain defined as “still free”, so as not to limit the great flexibility and migration ability created by the invention for future systems as well.
- the set of values can be expanded compared to the GSM mobile radio system in order to achieve further flexibility.
- system-specific signing information can be controlled by elements of the second subset of the set of values.
- a ranking list or priority for a handover procedure between different mobile radio systems can be controlled by the elements of the second subset, thus preventing an overload of a specific system.
- Several elements of the second subset can describe a control function, but with different characteristics of a parameter.
- the elements of the second subset can also be used advantageously for further signaling of control functions. If, for example, an image is to be transmitted to the previously described subscriber station during communication, for example during a telephone call with an existing GSM connection, the subscriber station can signal the transmission of the image in the W-CDMA system with an element of the second subset of the value set become. Services that require higher data rates can thus be transmitted separately without having to interrupt communication in the GSM mobile radio system or handing over all communication to the W-CDMA system.
- a frequency channel number (Absolute Radio Frequency Channel Number ARFCN) each stepping forward for the From ⁇ and upward direction determines the frequency channel.
- the frequency channel numbers 0 to 124 and 975 to 1023 are specified for E-GSM 900 (extended GSM 900) and the frequency channel numbers 512 to 885 for DCS 1800 (GSM1800).
- the value range is limited from 0 to 1023. If further frequencies for GSM mobile radio systems and the further frequency channels of the first subset are assigned as frequency channel numbers, the limited resource of the frequency channel numbers will soon be exhausted. If a further set of values is defined with the introduction of a further GSM mobile radio system, the control function can be realized according to the invention with the signaling by an element of the second subset of the set of values of the current GSM mobile radio system together with a signaling by an element of the further set of values. It is therefore not necessary to increase the previous set of values. Together with the element of the second subset of the set of values of the current GSM mobile radio system and a frequency channel number of the further set of values, a frequency channel of the further GSM mobile radio system can be addressed.
- a subscriber station that can establish connections in both GSM mobile radio systems can be transferred from one to the other GSM mobile radio system.
- the elements of the second subset serve as pointers, which point to further information for signaling. This information can be transmitted in the first frequency channel or in a second frequency channel. According to the invention, an uneven radio traffic volume of the two GSM mobile radio systems can be compensated for.
- the possibility of transferring a connection between the subscriber station and a base station is particularly advantageous at least one element of the second subset signal another mobile radio system.
- the further mobile radio system here is, for example, a TD-CDMA system which enables a transmission with a much higher data rate than the current GSM mobile radio system. Is the GSM mobile radio system overloaded or is the radio connection to
- an element of the second subset of the subscriber station can be used to offer a transfer of the connection to a base station of the TD-CDMA system.
- Another element can, for example, offer the transfer of the connection to a base station of the W-CDMA system.
- This signaling information can be used to control a subscriber station, so that the subscriber station, as an intelligent subscriber station, additionally queries information about neighboring cells and systems and independently decides on a handover procedure.
- the elements transmitted in the first frequency channel become the second
- Subset and additionally system-specific signaling information transmitted in a second frequency channel for triggering the control functions are jointly evaluated.
- the system-specific signaling information transmitted by means of the second frequency channel contains, for example, the frequency channel and / or the chip sequence of a CDMA system for the connection between the base station of the CDMA system and the subscriber station, which both have connections to the GSM mobile radio system and to CDMA System can build.
- the subscriber station receives information about neighboring cells and systems during a connection to the GSM mobile radio system and stores the associated base stations as possible candidates for a handover procedure in a list.
- the evaluation of system-specific signaling information is not limited to one frequency channel.
- System-specific signaling information can be transmitted via a second frequency channel so that system-specific signaling information is evaluated by each mobile radio system that can be received by the subscriber station. This system-specific signaling information is received or evaluated at the same time or independently of the element of the second subset of the set of values.
- the switching function between the time positions of the uplink direction (uplink) and the downlink direction (downlink) of a time-division duplex mobile radio system is particularly advantageously determined with the control function.
- the control function over the time of switching between the times of the uplink (uplink) and the downlink (downlink) of a time-division duplex mobile radio system is unknown in the current GSM mobile radio system.
- a subscriber station which can establish a connection both to a GSM mobile radio system and to a time-division duplex mobile radio system, for example a TD-CDMA mobile radio system, is able to evaluate the signaling information during the connection in the GSM mobile radio system and for example in the case of a particularly asymmetrical data rate between downlink and uplink to switch to the time-division duplex mobile radio system.
- system-specific signaling information enables binary information to be transmitted, which, by means of separate signaling, can better define the switchover time without influencing the maximum number of transmission channels.
- system-specific signaling information of a frequency duplex mobile radio system about the duplex spacing of the frequencies of the uplink (uplink) and the downlink (downlink) is transmitted by means of a second frequency channel.
- the duplex spacing of the frequencies can be signaled, for example, by means of a separate duplex number, which contains the corresponding signaling, both the frequency channel and the duplex spacing of the frequencies for the uplink (uplink) and the downlink (downlink).
- a separate duplex number which contains the corresponding signaling, both the frequency channel and the duplex spacing of the frequencies for the uplink (uplink) and the downlink (downlink).
- a variable duplex spacing cannot be addressed by the previous frequency channel numbers of the first subset of the value set.
- the duplex spacing of the frequencies can be kept variable and the upward direction (uplink) and the downward direction (downlink) can be controlled separately for different services in order to adapt the transmission as well as possible to the data rates required by the protocol.
- Figure 1 shows a set of values of the current GSM mobile radio system and the frequency channel numbers of a first
- FIG. 2 shows a scenario for the interaction capability between a GSM mobile radio system and a future mobile radio system.
- Figure 1 represents a set of values ARFCN, the first subset of frequency channel numbers for assigning frequency channels of the current GSM mobile radio system.
- the first subset contains the frequency channel numbers 0 to 124 GSM, 975 to 1023 EGSM (extended GSM) and 512 to 885 DCS (GSM 1800).
- the second subset N from 130 to 250 which has not yet been used can be used to signal additional control functions for the subscriber stations. Other options for second subsets are the elements 250 to 512 and 885 to 975. This means control functions that go beyond the assignment of the frequency channels of the GSM mobile radio system.
- frequency channels are not, as previously, assigned directly by means of frequency channel numbers, but are used for other purposes, as additional control functions.
- an element of the second subset N can initiate a transfer to a UMTS mobile radio system.
- FIG. 2 shows a scenario for a future mobile radio system.
- a subscriber station MS can be both a mobile station and a stationary wireless subscriber connection.
- the subscriber station MS is connected to a base station BS via a frequency channel F.
- the base station BS is connected to a telephone network PSTN via a network NW or to the Internet via a gateway.
- the subscriber station MS and the base station BS both contain a receiving and transmitting device for GSM and CDMA.
- the subscriber stations (here a stationary subscriber station) can also contain only one receiving and transmitting device for GSM.
- the receiving and transmitting device for GSM and CDMA on the base station side can be implemented in a base station BS or alternatively in separate base stations BS, so that in the latter case a base station BS only supports the GSM mobile radio system and the other base station BS only the CDMA system.
- the Internet signals the base station BS via the network NW that a moving picture is to be transmitted to the subscriber station MS.
- the subscriber station MS evaluates this signaling information by means of a second evaluation device AE, which in the exemplary embodiment is identical to a first evaluation device for the elements of the first subset, and requests system-specific signaling information from the CDMA system via a second frequency channel. Once the connection to the CDMA system has been established, the moving image is transmitted.
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- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00956103A EP1198962A1 (en) | 1999-07-28 | 2000-07-26 | Signalling method for a mobile telephone system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19935438.3 | 1999-07-28 | ||
DE1999135438 DE19935438A1 (en) | 1999-07-28 | 1999-07-28 | Signaling method in a GSM mobile radio system |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001010147A1 true WO2001010147A1 (en) | 2001-02-08 |
Family
ID=7916352
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/002461 WO2001010147A1 (en) | 1999-07-28 | 2000-07-26 | Signalling method for a mobile telephone system |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1198962A1 (en) |
CN (1) | CN1365581A (en) |
DE (1) | DE19935438A1 (en) |
WO (1) | WO2001010147A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4227457B2 (en) * | 2003-05-21 | 2009-02-18 | 株式会社エヌ・ティ・ティ・ドコモ | Radio control station and broadcast information transmission method |
US20070104133A1 (en) * | 2005-11-10 | 2007-05-10 | Chao Jim J | Method for improved frequency division duplex operation in a wireless communications system |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996033589A2 (en) * | 1995-04-19 | 1996-10-24 | Telefonaktiebolaget Lm Ericsson (Publ) | Multiple hyperband radiocommunications system |
US5884182A (en) * | 1997-05-29 | 1999-03-16 | Ericsson, Inc. | Method for responding to channel pointers using channel bands |
DE19746894A1 (en) * | 1997-10-23 | 1999-04-29 | Siemens Ag | Data transmission method for GSM mobile communications network |
EP0928119A2 (en) * | 1998-01-05 | 1999-07-07 | Nokia Mobile Phones Ltd. | Method for using effectively the broadcast capacity in a cell |
WO2000042808A1 (en) * | 1999-01-14 | 2000-07-20 | Ericsson, Inc. | Broadcasting of two generation cellular system control channel information over a three generation control channel to support roaming and handover to two generation cellular networks |
-
1999
- 1999-07-28 DE DE1999135438 patent/DE19935438A1/en not_active Ceased
-
2000
- 2000-07-26 EP EP00956103A patent/EP1198962A1/en not_active Withdrawn
- 2000-07-26 CN CN 00810935 patent/CN1365581A/en active Pending
- 2000-07-26 WO PCT/DE2000/002461 patent/WO2001010147A1/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996033589A2 (en) * | 1995-04-19 | 1996-10-24 | Telefonaktiebolaget Lm Ericsson (Publ) | Multiple hyperband radiocommunications system |
US5884182A (en) * | 1997-05-29 | 1999-03-16 | Ericsson, Inc. | Method for responding to channel pointers using channel bands |
DE19746894A1 (en) * | 1997-10-23 | 1999-04-29 | Siemens Ag | Data transmission method for GSM mobile communications network |
EP0928119A2 (en) * | 1998-01-05 | 1999-07-07 | Nokia Mobile Phones Ltd. | Method for using effectively the broadcast capacity in a cell |
WO2000042808A1 (en) * | 1999-01-14 | 2000-07-20 | Ericsson, Inc. | Broadcasting of two generation cellular system control channel information over a three generation control channel to support roaming and handover to two generation cellular networks |
Also Published As
Publication number | Publication date |
---|---|
CN1365581A (en) | 2002-08-21 |
EP1198962A1 (en) | 2002-04-24 |
DE19935438A1 (en) | 2001-02-08 |
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