CN1941991A - Fast accessing method in high-speed packet data system - Google Patents
Fast accessing method in high-speed packet data system Download PDFInfo
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- CN1941991A CN1941991A CNA2005101001619A CN200510100161A CN1941991A CN 1941991 A CN1941991 A CN 1941991A CN A2005101001619 A CNA2005101001619 A CN A2005101001619A CN 200510100161 A CN200510100161 A CN 200510100161A CN 1941991 A CN1941991 A CN 1941991A
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Abstract
The method comprises: the system informs the terminal that the system supports enhance access channel through overhead message; said terminal gets the time slot numbers of access preamble of the enhance access channel through access parameter overhead message; said terminal determines the length of the preamble of sending access message probe and determines the access channel rate of sending access channel probe; according to the load length to be transmitted and the access channel rate, the terminal determines the length of probe packet, and shortens the length of access packet; said terminal sends the access probe, which comprises the probe preamble and the access probe packet.
Description
Technical field
The present invention relates to a kind of cut-in method of digital mobile communication system, in particular a kind of based on CDMA (Code Division Multiple Access code division multiple access) 2000 HRPD (high rate packet data) HRPD (High Rate Packet Data is hereinafter to be referred as HRPD) cell mobile communication systems of standard or the fast access method of group system.
Background technology
In existing wireless communication technology, terminal and system carry out information interaction by air wireless interface, as shown in Figure 1.When terminal needs system that it is served, must communicate the application of channel earlier, this process is referred to as access procedure.In relevant prior art field, below be the related technological concept of the inventive method:
Random access procedure: terminal and system set up professional is connected, obtains to serve before, earlier at a shared channel, be to send some to system on the access channel to set up the professional information necessary that connects, the moment that terminal is initiated to insert is at random, and this process is called random access procedure.
Access exploration: terminal sends certain sequence as an access attempts.An access exploration sequence comprises two parts, prefix and access package.Prefix is used for the access sequence of system acquisition terminal, and access package carries the access information of terminal.
Load: expression effective information bit in the Network Transmission.
What the HRPD system that uses adopted at present is common access channel or enhancing access channel, user's access exploration is divided into prefix and access package two parts, and the prefix of common access channel the shortest is 16 time slots, promptly 26.66 milliseconds, the prefix the shortest that strengthens access channel is 4 time slots, promptly 6.66 milliseconds; Access package is minimum to be a frame, i.e. 16 time slots.The access exploration structure of common access channel as shown in Figure 2, the access exploration structure that strengthens access channel is as shown in Figure 3.An access exploration comprises a prefix 203 in Fig. 2, with one or more physical layer packet packets 204, adopt the terminal of common access channel must be in the starting point of duration in access channel cycle 202, access channel cycle zero-time 201 begins to send access exploration, and the duration that actual access exploration sends is marked as 205; An access exploration comprises a prefix 303 in Fig. 3, with one or more physical layer packet packets 304, adopt the terminal that strengthens access channel to insert offset time 306 through one section after the starting point 301 of duration in access channel cycle 302 and begin to send access exploration again, the duration that its actual access exploration sends is 305.
In existing HRPD system, send the minimum needs 16 time slot prefixes of access exploration+1 frame access package=53.33 millisecond.Access channel speed immobilizes, and is 9.6k, illustrate as shown in Figure 4 that 401 of the prefixes of access channel comprise a pilot channel turn-on time, and data division comprises a pilot channel 402 and data channel 403.
The HRPD system that strengthens can improve the speed of access channel, but the loaded length of the access package that will send can not be less than the minimum load length legislations of selected access rate correspondence.The corresponding relation of existing access rate and loaded length such as following table:
| Transmission rate (kilobits/second kbps) | Minimum load (bit) | Maximum load (bit) |
| 9.6 | 1 | 232 |
| 19.2 | 233 | 488 |
| 38.4 | 489 | 1000 |
Therefore, the turn-on time of prior art is oversize, makes user's sensory system speed too slow.
Summary of the invention
The purpose of this invention is to provide a kind of method that in high-speed grouped data system, inserts fast, in order to overcome in the prior art long shortcoming turn-on time, introduce and strengthen access channel, and improve strengthening access channel, realize the quick access in the wireless communications application, shorten turn-on time, and then improve user's impression.
Technical scheme of the present invention comprises:
A kind of method that in high-speed grouped data system, inserts fast, it may further comprise the steps:
A, terminal is informed by Overhead Message by system, system's support strengthens access channel;
B, described terminal is known the Access Preamble timeslot number of described enhancing access channel by the access parameter Overhead Message;
C, described terminal decision sends and inserts the length of sewing before the message exploration;
D, described terminal is determined to send the access channel speed that access channel is soundd out, and this speed does not have corresponding relation with loaded length, the highest access rate that adopts terminal and base station system to support;
E, described terminal is according to the loaded length and the access channel speed that will send, and determines the length of the access exploration bag that will send, and shortening to the time slot is that the access package of unit is long;
F, the actual transmission of described terminal access exploration, this access exploration sew and the access exploration packet before comprising access exploration.
Described method, wherein, the prefix length that described access message is soundd out is the numerical value of terminal and base station system acquiescence.
Described method, wherein, described prefix length is 4 time slots.
Described method, wherein, described load and sends with the speed of 38.4k within 232 bits.
Described method, wherein, described access channel speed is 19.2kbps or 38.4kbps.
A kind of method that in high-speed grouped data system, inserts fast provided by the present invention, compared with prior art, considering under the compatible prerequisite, Reverse Access Channel has been carried out optimal design, change the part protocol contents that strengthens access channel, comprise the principle of access package length and access channel rate selection, shortened the time of subscriber access system, thereby duration is set up in the connection that has effectively reduced the user, has significantly improved user's access and has experienced.
Description of drawings
Fig. 1 is the graph of a relation between terminal and the system;
Fig. 2 is the access exploration structure chart of the access channel of prior art;
Fig. 3 is the access exploration structure chart of the enhancing access channel of prior art;
Fig. 4 is effect schematic diagram turn-on time of the HRPD system conventional of prior art;
Fig. 5 is the flow chart of the inventive method fast access method in the HRPD system;
Fig. 6 is effect schematic diagram turn-on time of the inventive method fast access method in the HRPD system.
Embodiment
Further specify the technical scheme of the inventive method below in conjunction with embodiment and accompanying drawing.
The method that in high-speed grouped data system, inserts fast of the present invention, the speed of its access channel and loaded length are irrelevant, and it is unit that access exploration bag length shortens to the time slot.Fast access method of the present invention specifically may further comprise the steps:
The first step, terminal is informed by Overhead Message by system, system's support strengthens access channel;
In second step, terminal is known the Access Preamble timeslot number that strengthens access channel by the access parameter Overhead Message;
In the 3rd step, the terminal decision sends the length of prefix when inserting the message exploration; Preferably, Access Preamble length can be the numerical value of terminal and base station system acquiescence;
In the 4th step, terminal determine to send the access channel speed that access channel is soundd out, and speed do not have corresponding relation with loaded length, the highest access rate that employing terminal and base station system can be supported, and promptly load also can be used the speed transmission of 38.4k within 232 bits; Preferably, access channel speed is brought up to 19.2k or 38.4kbps;
In the 5th step, terminal is according to the loaded length and the access channel speed that will send, and determines the length of the access exploration bag that will send, and shortening to the time slot is that the access package of unit is long;
In the 6th step, the actual transmission of terminal access exploration comprises access exploration prefix and access exploration packet.
As shown in Figure 5, fast access method flow process in the HRPD system of the inventive method has wherein specifically comprised following steps:
Terminal is informed by Overhead Message by 501 systems, and system's support strengthens access channel;
502 terminals know that by the access parameter Overhead Message Access Preamble timeslot number that strengthens access channel is 4 time slots;
The length that the decision of 503 terminals sends prefix when inserting the message exploration is 4 time slots, promptly 6.66 milliseconds;
The highest access rate of 504 terminal supports is 38.4kbps, and the highest access rate of system's support is 38.4kbps, and terminal determines to adopt 38.4kbps access channel speed to send the access channel exploration, and the length of access channel probe packet is unit with the time slot;
The load that 505 terminals will send is 232 bits, adopts the access rate of 38.4kbps, and the access packet can send in 4 time slots and finish;
The actual transmission of 506 terminals access exploration comprises the access exploration prefix of 4 time slots and the access exploration packet of 4 time slots.
After adopting the inventive method, its turn-on time effect as shown in Figure 6, the prefix of access channel comprises a pilot channel 601, and data division comprises a pilot channel 602 and data channel 603, sends prefix 604+4 the time slot access package length 605=13.33 millisecond that an access exploration needs 4 time slots.Can shorten 40 milliseconds of turn-on times on this step of transmission access message, the load that terminal need send is big more, and the inventive method is just long more with respect to the turn-on time that traditional access way shortened, and is just obvious more to user's improvement.
In sum, the fast access method that the present invention proposes can shorten the time of terminal connecting system, sets up duration thereby effectively reduced the connection of calling out, and for the business of delay sensitive, can significantly improve user's access and experience.
But should be understood that above-mentioned description at embodiment is comparatively detailed, can not therefore be interpreted as the restriction to scope of patent protection of the present invention, scope of patent protection of the present invention should be as the criterion with claims.
Claims (5)
1, a kind of method that in high-speed grouped data system, inserts fast, it may further comprise the steps:
A, terminal is informed by Overhead Message by system, system's support strengthens access channel;
B, described terminal is known the Access Preamble timeslot number of described enhancing access channel by the access parameter Overhead Message;
C, described terminal decision sends and inserts the length of sewing before the message exploration;
D, described terminal is determined to send the access channel speed that access channel is soundd out, and this speed does not have corresponding relation with loaded length, the highest access rate that adopts terminal and base station system to support;
E, described terminal is according to the loaded length and the access channel speed that will send, and determines the length of the access exploration bag that will send, and shortening to the time slot is that the access package of unit is long;
F, the actual transmission of described terminal access exploration, this access exploration sew and the access exploration packet before comprising access exploration.
2, method according to claim 1 is characterized in that, the prefix length that described access message is soundd out is the numerical value of terminal and base station system acquiescence.
3, method according to claim 2 is characterized in that, described prefix length is 4 time slots.
4, method according to claim 1 is characterized in that, described load and sends with the speed of 38.4k within 232 bits.
5, method according to claim 4 is characterized in that, described access channel speed is 19.2kbps or 38.4kbps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101001619A CN100499862C (en) | 2005-09-30 | 2005-09-30 | Fast accessing method in high-speed packet data system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101001619A CN100499862C (en) | 2005-09-30 | 2005-09-30 | Fast accessing method in high-speed packet data system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1941991A true CN1941991A (en) | 2007-04-04 |
| CN100499862C CN100499862C (en) | 2009-06-10 |
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| CNB2005101001619A Expired - Fee Related CN100499862C (en) | 2005-09-30 | 2005-09-30 | Fast accessing method in high-speed packet data system |
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