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1、JOINT INTERIM STANDARD GMR-2 Series 05 (05.008) Radio Interface Physical Layer Specifications - Radio Subsystem Link Control IS-J-STD-781-Series 5 NOVEMBER 2001 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Reprwmting the telennimunicationv indusiry in aysoriation with the Electronic Indusiria Alliance El
2、sctron ic Ind wtries. Alliance EUROPEAN TELECOMMUNICATIONS STANDARDS INSTITUTE Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:07:15 MDTNo reproduction or networking permitted w
3、ithout license from IHS -,-,- NOTICE FROM THE TELECOMMUNICATIONS INDUSTRY ASSOCIATION TIA/EIA Engineering Standards and hblications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of
4、 products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards and hblications shall not in any respect preclude any member or nonmember of TIA/EIA from manufacturing or selling products not conforming to s
5、uch Standards and hblications, nor shall the existence of such Standards and hblications preclude their voluntary use by those other than TIA/EIA members, whether the standard is to be used either domestically or internationally. Standards and hblications are adopted by TIA/EIA in accordance with th
6、e American National Standards Institute (ANSI) patent policy. By such action, TIA/EIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard or hblication. Note: The users attention is called to the possibiliS, that compliance w
7、ith this document may require use o f one or more inventions covered by patent rights. By publication o f this standard, Interim Standard, or TSB, no position is taken with respect to the validio o f those claims or o f any patent rights in connection therewith. The patent holder) so far identified
8、have, however, filed statements o f willingness to grant licenses under those rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such licenses. Details may be obtained from the standards developer. TIA/EIA AND JOINT INTERIM STANDARDS Joint Interim Standa
9、rds contain information deemed to be of technical value to the industry, and are published at the request of the originating Committee without necessarily following the rigorous public review and resolution of comments which is a procedural part of the development of an American National Standard (A
10、NS). Interim Standards should be reviewed on a periodic basis by the formulating Committee and a decision made on whether to proceed to develop a TIA/EIA Standard on this subject. Interim Standards must be upgraded or cancelled by the Committee before the end of their third year of existence. hblica
11、tion of this Joint Interim Standard for trial use and comment has been approved by the Telecommunications Industry Association. Distribution of this Joint Interim Standard for comment shall not continue beyond 36 months from the date of publication. It is expected that following this 36 month period
12、, this Joint Interim Standard, revised as necessary, will be submitted to the American National Standards Institute for approval as an American National Standard. Suggestions for revision should be directed to: Standards the second digit (m) is incremented for all other types of changes, i.e. techni
13、cal enhancements, corrections, updates, etc. Intellectual Property Rights The users attention is called to the possibility that compliance with this Interim Standard may require use of an invention covered by patent rights. By publication of this Interim Standard, no position is taken with respect t
14、o the scope or validity of such patent claims or of any patent rights in connection therewith. One or more parties have notified the TIA that they hold patent rights applicable to this Interim Standard. Each patent holder has, however, filed a statement of willingness to grant a license under these
15、rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such licenses. A copy of the statement may be obtained from the TIA. vi Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Win
16、g, Bernie Not for Resale, 03/29/2007 21:07:15 MDTNo reproduction or networking permitted without license from IHS -,-,- TINEIA IS-781.05.008 1 Scope This document specifies the Radio sub-system link control implemented in the MES, Satellite, and Gateway of the GMR-2 system. 2 References The followin
17、g documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. For a specific reference, subsequent revisions do not apply.
18、For a non-specific reference, subsequent revisions do apply. il GMR-2 O 1.004: “GEO-Mobile Radio interface specifications: Abbreviations and acronyms” Note: GMR-2 03.009: “GEO-Mobile Radio interface specifications: Handover procedures” Note: GMR-2 03.022: “GEO-Mobile Radio interface specifications:
19、Functions related to mobile earth station (MES) in idle mode” Note: GMR-2 04.004: “GEO-Mobile Radio interface specifications: GMR Layer 1 general requirements” Note: GMR-2 04.006: “GEO-Mobile Radio interface specifications: Mobile Earth Station - Network Data Link L) Layer specification” Note: GMR-2
20、 04.008: “GEO-Mobile Radio interface specifications: Mobile Radio Interface Layer 3 specification” This document is not yet published. This document is not yet published. Pl 31 This document is not yet published. 41 This document is not yet published. PI This document is not yet published. 61 Note:
21、This document is not yet published. 71 GMR-2 05.002: “GEO-Mobile Radio interface specifications: Multiplexing and multiple access on the radio path” Note: GMR-2 05 .O05 : “GEO-Mobile Radio interface specifications: Radio transmission and reception” Note: This document is not yet published. SI This d
22、ocument is not yet published. 91 GMR-2 06.0 12: “GEO-Mobile Radio interface specifications: Comfort noise aspect for Basic Rate Speech Traffic Channels” Radio Subsystem Link Control 1 Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/11111
23、11001, User=Wing, Bernie Not for Resale, 03/29/2007 21:07:15 MDTNo reproduction or networking permitted without license from IHS -,-,- TINEIA IS-781.05.008 Note: GMR-2 06.03 1 : “GEO-Mobile Radio interface specifications: Basic Rate Speech, Part: 3 Discontinuous Transmission (DTX) for Basic Rate Spe
24、ech Traffic Channels” This document is not yet published. lo) 3 Note: This document is not yet published. Defi n i tions and ab brevia tions 3.1 Definit ions Special terms and their definitions, which are applicable to this document and in addition to those defined internally, are as follows: Immedi
25、ate Assignment - The procedure used to establish a Radio Resource connection between the MES and the network. It concludes with an IMMEDIATE ASSIGNMENT message sent by the network to the MES via the SDCCH granting a trafic channel for communications. CELL-RESELECT-HYSTERESIS - The parameter used to
26、prevent frequent spot beam switches and the associated location updates. The concern applies to cases where the satellite antenna sidelobe levels allow an MES to receive the S-BCCH from spot beams having LAIS different from the LAI of the beam(s) upon which it is currently registered. A different LA
27、I and spot beam is selected only if it is “better” in terms of the path loss criterion than any of the spot beams in the current LAI by at least the value of CELL - RESELECT - HYSTERESIS. 3.2 Abbreviations Abbreviations used in this specification are listed in the GMR-2 acronym list GMR-2 O1 .O04 i
28、4 Gen era I The radio sub-system link control aspects that are addressed are as follows: a) RF power control; b) Radio link failure; c) Beam selection and re-selection in Idle mode. Handover may also be employed to meet network management requirements, e.g., relief of congestion. Handover may occur
29、during a call from S-DCCH to S-TCH, e.g., during the initial signalling period at call Set-up. The handover may be between channels on the same spotbeam. Examples are given of handover strategies, however, theses will be determined in detail by the network operator. Adaptive control of the RF transm
30、it power from a MES and from the Gateway is implemented in order to optimise the forward and return link performance and minimise the effects of Co-channel interference in the system. The criteria for determining radio link failure are specified in order to ensure that calls which fail either from l
31、oss of radio coverage or unacceptable interference are satisfactorily handled by the network. Radio link failure may result in release of a call in progress. Procedures for spotbeam selection and re-selection while in Idle mode (i.e., not actively processing a call), are specified in order to ensure
32、 that an MES can select a satellite spotbeam with which it can reliably communicate on both the radio forward and return links. 2 Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21
33、:07:15 MDTNo reproduction or networking permitted without license from IHS -,-,- TINEIA IS-781.05.008 Information signalled between the MES and Gateway is summarized in Tables 1 1 .O-1 and 1 1 .O-2. A full specification of the Layer 1 header is given in GMR-2 04.004 4, and of the Layer 3 fields in G
34、MR-2 04.008 6. 5 Han dove r Network directed handovers can occur for reasons other than radio link control, e.g. S-SDCCH to S- TCH transfers. The following describes the process for intra-cell handovers that result rom interference and fading mitigation. 5.1 Overall process The overall handover proc
35、ess is implemented in the MES and gateway. Measurement of radio subsystem forward performance is made in the MES. These measurements are signalled to the gateway for assessment. The gateway measures the return performance for the MES being served. Initial assessment of the measurements in conjunctio
36、n with defined thresholds and intra-spotbeam handover strategy are performed in the gateway. Optionally, the gateway may measure the interference levels in unassigned channels on active carriers and manages a database of ?clear,? ?unacceptable? and ?unknown? channels for use in initial assignments a
37、nd handover assignments. NOTE: 5.2 MES measurement procedure The MES shall monitor the forward signal and its quality in its serving spotbeam. The requirements for measurement are given in section 10. 5.3 Gateway m eas u re ment p roced u re A procedure shall be implemented in the gateway by which i
38、t monitors the return RX signal level and quality rom each MES being served by the spotbeam. The requirements for measurement are given in section 10. 5.4 Strateg y The intra-spotbeam handover strategy employed by the network for radio link control determines the handover decisions that are made bas
39、ed on the measurement results reported by the MES/gateway and various threshold parameters set for each spotbeam. The exact handover strategies will be determined by the gateway operators in that the algorithm threshold parameters are configurable. These configurable items allow the gateway operator
40、 to tailor the handover control algorithm to suit a desired strategy and to fine-tune the algorithm as trafic and interference data are accumulated. For a MES in an interference scenario, intra-spotbeam handover rom one channel/timeslot in the serving spotbeam to another channel/timeslot in the same
41、 spotbeam can be performed if the link measurements show a low RXQUAL, but a high RXLEV on the serving spotbeam. Handover can occur either to a timeslot on a new carrier or to a different timeslot on the same carrier and may include a change of bearer rate and channel coding. For a given set of forw
42、ard and return link measurements, the decision to handover, and whether or not that handover will include a change of bearer rate and channel coding, will depend upon operator configurable threshold settings. NOTE: Optionally, based on interference measurements, the gateway may attempt handovers to
43、currently unassigned channels in the following order: a) Channels categorized as ?Clear?; b) Channels categorized as ?Unknown? (insufficient or invalid measurement data); Radio Subsystem Link Control 3 Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=I
44、HS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:07:15 MDTNo reproduction or networking permitted without license from IHS -,-,- TINEIA IS-781.05.008 c) Channels categorized as “unacceptable” in order of lowest to highest interference band only if handover includes a change f
45、rom S-TCWQBS to S-TCWHRS. For a MES in a fadinghlockage scenario, intra-spotbeam handover from one channel/timeslot in the serving spotbeam to another channel/timeslot in the same spotbeam, can be performed if the link measurements show a low RXQUAL, and a low RXLEV coupled with high commandedhpleme
46、nted transmit power levels on the serving spotbeam. In this case a handover from S-TCWQBS to S- TCWHRS is required since the MES is not suffering from an interference condition which could be aided by a clearer channel of the same bearedcoding. The algorithm for handover shall be as specified in GMR
47、-2 03.009 2. 5.5 Restrict ions Intra-spotbeam handover shall not be required for single hop user-to-user connections or for S-SDCCH connections. Handovers with no change of bearer rate and coding shall only occur between two S-TCWQBS trafic channels. Handovers with change of bearer rate and channel
48、coding shall only occur from S-TCWQBS to S- TCWHRS traffic channels. Handovers with change of bearer rate and channel coding shall maintain the same vocoder on the S-TCWHRS as on the S-TCWQBS traffic channel. 6 RF power control 6.1 Overall process RF power control is employed to minimise the transmi
49、t power required by a MES or Gateway while maintaining the quality of the radio links. By minimising the transmit power levels, interference to co- channel users is reduced and satellite utilisation is increased. 6.2 MES implementation RF power control shall be implemented in the MES. The power control level to be employed by the MES is indicated by mea