JP5540123B2 - TTI channel allocation and UE allocation to channels - Google Patents

Description

  The present invention is directed to HSUPA (HSPDA) base stations and networks that are operated with devices capable of supporting both 2 and 10 ms TTI.

  In Release 6 of the Wideband Code Division Multiple Access (WCDMA) specification, a high-speed uplink packet access (HSUPA (also called enhanced uplink)) communication scheme is defined in addition to the downlink high-speed packet data access (HSPDA) scheme. This is for the purpose of adapting to the bit rate provided by the latter, thereby satisfying the demands of improved interactive, background and streaming services. Enhanced UL is described in 3GPP TS 25.309 “FDD Enhanced Uplink Overall description”, which is a prior art document.

In FIG. 1, an overview of the HSUPA network (channels associated with HSDPA are not included in the figure) is shown. The network includes a core network communicating with a radio network controller (RNC) over an lu interface, a first base station NodeB (B ₁ ), and a second base station NodeB (B ₂ ), both The base station includes an EUL scheduler unit. The EUL scheduler is also called a MAC-e scheduler, and communicates with the RNC over each lub interface.

  The following HSUPA channels are transmitted over the air interface, and the E-AGCH carrying the absolute grant signaling from the MAC-e scheduler to the UE and the relative usage rights signaling: E-RGCH for transmission, E-HICH carrying acknowledgment response from NodeB decoding data transmitted by UE, and dedicated physical channel (DPCH) or partial (Fractional) carrying transmission power control (TPC) command There are DPCH, extended DPDCH (E-DPDCH) carrying the MAC-e payload, and extended DPCCH (E-DPCCH) carrying the MAC-e control signaling.

  In this example (E-AGCH is transmitted only from the serving cell), NodeB1 constitutes a serving cell, while NodeB2 constitutes a non-serving cell.

  According to the HSUPA specification, an extended dedicated channel (E-DCH) high-speed uplink transport channel is, for example, a short transmission time interval (TTI), a high-speed hybrid automatic repeat request (Automatic Repeat Request with soft recombination). ARQ), providing a number of new features such as fast scheduling for reduced delay, increased data rate and increased capacity.

  When the UE sets up communication with a NodeB, 3G paging signal, etc., the setup procedure may be followed by an HSDPA session, eg for downloading / surfing internet pages using TCP. Depending on the functionality of the user entity, this may further include HSUPA transmission, where the NodeB sends a TCP message on the E-DPDCH downlink channel that is part of the HSUPA standard and on the uplink to the NodeB. A quick TCP response is sent. It has been shown that the speed at which a UE can respond to a NodeB on the uplink via the TCP protocol affects the overall download speed of larger files from the NodeB.

  After the user entity is ready to use the HSUPA service with the NodeB, the user entity is notified for which E-AGCH code it will receive absolute usage rights.

  The E-AGCH channel is configured in the NodeB in the configuration or reconfiguration procedure with the RNC via the NBAP signaling protocol. In FIG. 16, an NPAB E-AGCH channel assignment for a serving radio link (RL) is shown. Subsequently, downlink traffic is scheduled to the UE on the E-AGCH channelization code by a time multiplexing approach.

  One type of message sent on the downlink E-AGCH channel is "absolute grant", i.e. the user entity has the right to send at a given bit rate on the uplink. It is a message to acknowledge. The Node-B MAC-e scheduler issues absolute usage rights. Since the need for bandwidth changes dynamically over time, it is beneficial to quickly adjust the release of power by the user entity so that bandwidth is not unnecessarily wasted.

  An E-AGCH may be defined to have one to multiple (currently up to four) channelization codes, typically the number is the E-DCH radio link in the cell. Less than the number of (RL). The actual number of available E-AGCH codes changes dynamically over time (but on a somewhat long time basis), and the assignment is determined according to the procedure between the NodeB and the RNC. FIG. 17 shows this procedure.

  Since E-AGCH channelization codes are limited and cell capacity is limited by code and power, it is desirable to use as few codes as possible for E-AGCH transmission. . For MAC-e schedulers that frequently change usage rights for UEs, it is important to use E-AGCH channels efficiently.

  According to 3GPP, two operation modes, a 10 ms TTI (transmission time interval) mode and a 2 ms TTI mode are specified. All UE categories support 10ms TTI. Categories 2, 4 and 6 have 2ms TTI as an option. The maximum peak rate is 2 Mbps for 10 ms HSUPA TTI and 5.76 Mbps for 2 ms HSUPA TTI. If four codes are sent in parallel, two codes should be sent with SF2 and two with SF4.

  It is expected that only UE categories that can exclusively process 10 ms TTI will be available on the market first. Depending on market success and market demand, it can be expected that devices capable of handling 2 ms will then be available.

  FIG. 2 corresponds to 3GPP TS25.211 and shows that the transmissions on the E-AGCH for the 10 ms TTI and 2 ms TTI subframes need to be aligned. For both TTI types, the delay is set to 5120 chips in the context of the P-CCPCH channel.

  As shown in FIG. 3, there are UEs in a given cell, and there are UEs that can handle at least 2 ms TTI (hereinafter referred to as second interval TTI type UEs) and 10 ms TTI. In a prior art scenario where there are also UEs that can be exclusively processed (first interval TTI type UEs), the NodeB has the same E-AGCH channelization code, ie one or more 2 ms TTI UEs on the radio link (RL) and Place one or more 10 ms TTIs. In the example of FIG. 3, if the MAC-e scheduler decides to send the absolute usage right first to a 2 ms TTI UE and then to a 10 ms TTI UE, there is an 8 ms transmission gap. As shown in FIG. 2, a “transmission gap” on the E-AGCH can occur because the timing characteristics must meet the basic requirements for the start time. This use of E-AGCH is inefficient and can cause unnecessary extra delay.

  In the above scenario, the start of 10 ms TTI is permitted at a time that is an integral multiple of the 10 ms TTI interval from the given reference time shown in FIG. Multiple 2 ms TTI transmissions may occur during a 10 ms TTI transmission.

  A first object of the present invention is to facilitate economical channel resource allocation in HSUPA base stations, in particular efficient utilization of shared downlink control resources.

A method for operating a high speed uplink base station including at least one downlink control channel (E-AGCH) scheduled to receive absolute usage rights for a mobile user entity, comprising: The channels are arranged with a transmission interval corresponding to the first interval (P1) or the second interval (P2), and candidates for the start of the first transmission interval (P1) are on the additional control channel (P-CCPCH). Is defined by a period corresponding to an integral multiple of the length of the first transmission interval from the (t1) frame defined in advance, and a candidate for starting the second transmission interval (P2) is an additional control channel (P -CCPCH) defined by a period corresponding to an integral multiple of the length of the second transmission interval (P2) from the predefined (t1) frame, and the base Is capable of communicating with the first type user entity (UE1) that can communicate exclusively within the first transmission interval (P1) and within the second transmission interval (P2). This object is achieved by a method configured to communicate with a type of user entity (UE2). The above method
-Positioning or relocating the first downlink control channel exclusively having the transmission interval of the first interval (10 ms) and exclusively having the transmission interval of the second interval (2 ms) Deploying or relocating a second downlink control channel (ii; 11ii-16ii., 27ii);
Assigning or reassigning user entities to each of the deployed downlink control channels (v), on the other hand,
Scheduling traffic for assigned user entities (x);
Further included.

  According to a further aspect, the method includes the further step of cooperating in the configuration or reconfiguration (i, 10i) of the downlink control channel, in which a downlink control channel is added or deleted for the base station Is done.

  A second object of the present invention is to facilitate an alternative allocation of economical channel resources in HSUPA base stations, in particular efficient utilization of shared downlink control resources.

A method for operating a high speed uplink base station including at least one downlink control channel (E-AGCH) scheduled for mobile user entities to receive absolute usage rights, comprising:
The downlink control channel is arranged with a transmission interval corresponding to the first interval (P1) or the second interval (P2),
A candidate for the start of the first transmission interval (P1) is a period corresponding to an integral multiple of the length of the first transmission interval from the predefined (t1) frame on the additional control channel (P-CCPCH). Defined by
Candidates for starting the second transmission interval (P2) are integers of the length of the second transmission interval (P2) from the predefined (t1) frame on the additional control channel (P-CCPCH) Defined by a period equivalent to
The base station can communicate with the first type user entity (UE1) capable of communicating exclusively within the first transmission interval (P1) and within the second transmission interval (P2). This further object is achieved by a method configured to communicate with a second type of user entity (UE2).
The above method
Calculating the load on each configured channel; (iii);
Assigning (vi) or reassigning a user entity to each deployed downlink control channel (vi),
Scheduling traffic (x) for user entities assigned at least on a given channel having a transmission interval of the first interval (P1) and / or the second interval (P2);
Including
The ratio of the first interval (P1) to the second interval (P2) changes dynamically.

  Advantageously, the method includes a further step of cooperating in the configuration or reconfiguration (i, 10i) of the downlink control channel, where a downlink control channel is added or deleted for the base station .

  According to a further aspect of the present invention, the downlink control channel is an enhanced absolute grant channel (E-AGCH).

  The downlink (DL) capacity in a WCDMA (Wideband Code Division Multiple Access) cell is typically limited by power and / or code. It is therefore beneficial to use as few channelization codes as possible. The fewer serving radio links, also called channels in the cell, the fewer channelization codes are required to transmit absolute usage rights over the E-AGCH. The present invention thus limits the codes that are configured based on the number of serving radio links in the cell.

  Further advantages will be apparent from the following detailed description of the invention.

Fig. 2 shows basic elements of a prior art HSUPA network. Figure 6 shows the HSUPA specification Release 6 citation for timing characteristics for E-AGCH channels using either 10 or 2ms TTI. Fig. 2 illustrates a possible prior art scenario for a combined TTI mode transmission using two E-AGCH channels. The arrangement | positioning of the E-AGCH channel which concerns on the 1st Embodiment of this invention is shown. Fig. 3 shows a user entity according to an embodiment of the invention. 1 shows a NodeB according to an embodiment of the present invention. Fig. 4 illustrates a further scenario for combined TTI mode transmission using two E-AGCH channels according to a preferred embodiment of the present invention. FIG. 8 shows timing characteristics in relation to FIG. 1 shows a first embodiment of a routine for the configuration of an E-AGCH channel, the arrangement of the E-AGCH channel, and the allocation and scheduling of UEs to an RL according to the present invention. 3 shows an alternative to the first embodiment. 2 shows a second alternative of the first embodiment according to the invention. 3 shows a third alternative of the first embodiment. The 2nd Embodiment of the routine about the structure of the E-AGCH channel which concerns on this invention, and allocation and scheduling to UE RL is shown. Fig. 9 shows a dynamic load value calculation routine that optionally forms part of the second embodiment. The viewpoint of 2nd Embodiment is shown. 10 shows an example of assignment of user entities to channels according to a second embodiment according to the NBAP protocol. 2 shows a channel configuration according to the NBAP protocol. Fig. 4 shows a channel reconfiguration according to the invention using NBAP. 10 shows a scheduling scenario according to the second embodiment.

[First embodiment of the present invention]
FIG. 9 relates to the general procedure performed in the NodeB for E-AGCH configuration, channel placement, UE allocation to E-AGCH codes, and UE scheduling.

A method for operating a high speed uplink base station including at least one downlink control channel (E-AGCH) scheduled to receive absolute usage rights for a mobile user entity, comprising: The channels are arranged with a transmission interval corresponding to the first interval (P1) or the second interval (P2), and candidates for the start of the first transmission interval (P1) are on the additional control channel (P-CCPCH). Is defined by a period corresponding to an integral multiple of the length of the first transmission interval from the (t1) frame defined in advance, and a candidate for starting the second transmission interval (P2) is an additional control channel (P -CCPCH) defined by a period corresponding to an integral multiple of the length of the second transmission interval (P2) from the predefined (t1) frame, and the base Is capable of communicating with the first type user entity (UE1) that can communicate exclusively within the first transmission interval (P1) and within the second transmission interval (P2). A method is shown configured to communicate with a type of user entity (UE2). The above method
-Positioning or relocating the first downlink control channel exclusively having the transmission interval of the first interval (10 ms) and exclusively having the transmission interval of the second interval (2 ms) Deploying or relocating the second downlink control channel (ii; 11ii-16ii., 26ii, 27ii);
Assigning or reassigning user entities to each of the deployed downlink control channels (v), on the other hand,
Scheduling traffic for assigned user entities (x);
including.

  The description of UE scheduling x), the latter step x), can be performed in many known ways. According to the present invention, scheduling of packets on individual TTI slots occurs according to a given scheduling routine, but is limited to the v) channel to which the UE is assigned.

Although not required to be performed as frequently as the step of assigning user entities, the method is further advantageous:
-Comprising (i, 10i) configuring or reconfiguring the downlink control channel, in which an E-AGCH downlink control channel is added or deleted for the base station.

  For example, the first individual E-AGCH channelization code is arranged to have exclusively a 10 ms TTI interval P1, and the second individual E-AGCH channelization code has an exclusive 2 ms interval P2. , NodeB uniquely places time slots on individual E-AGCH channelization codes ii).

  In other words, at least some channelization codes used according to the channel arrangement according to the first embodiment of the present invention are such that the arranged E-AGCH channel does not contain a combination of 2 ms and 10 ms intervals. . Hereinafter, such a method of arranging the E-AGCH channel will be referred to as a “clean” TTI channel arrangement, and the E-AGCH having such an arrangement is referred to as a “clean” E-AGCH channel.

  According to one aspect of this embodiment, a 2 ms TTI type user entity can also handle 10 ms TTI, so that a UE capable of performing a 2 ms TTI interval can run on a clean E-AGCH channel with 2 ms TTI or 10 ms TTI. It is preferably scheduled anywhere on the clean E-AGCH.

  7 and 8, another E-AGCH channel placement scheme is shown in which a 10 ms TTI interval is interrupted by a 2 ms TTI interval in a time multiplexed manner. According to the present invention, these interrupts may be periodic or may be subject to dynamic allocation where the ratio of 10 ms intervals to 2 ms intervals varies. This channel arrangement is referred to as a “mixed” channel arrangement, and an E-AGCH channel having such an arrangement is referred to as a “composite” E-AGCH channel.

  In FIG. 10, a routine executed in the NodeB is provided, and the configuration of the E-AGCH channel shown in FIG. 9 (i), the channel arrangement (ii), and the allocation of radio links to UEs (v ) Is further described as to how the start situation is implemented. It should be understood that step x) is also performed.

  In steps 11ii, 12ii and 13ii, it is checked whether one, two or a plurality of E-AGCH channels are configured according to the NBAP protocol.

  If only one channel is assigned (step 11ii), the NodeB determines that there is no option, and that all UEs must share a given E-AGCH channel code (step 14ii). The UE is then assigned to the channel (v). For this reason, E-AGCH channels are arranged with a predetermined “composite” pattern of 2 ms and 10 ms TTI in the layout as shown in FIGS.

  If two channels are available (step 12ii), the routine proceeds to step 15ii where one channel is placed with only 10ms TTI and the other channel is placed with only 2ms TTI, ie both The channel becomes a clean channel.

  According to the first aspect of the first embodiment, even if the 10 ms channel has free slots, the first interval TTI type UE will be the former 10 ms E− unless the resources are excluded on the 2 ms channel. Scheduled on the AGCH channel, second interval TTI type UEs are preferably scheduled on the latter 2 ms channel. Note that a 2 ms UE configured as a “10 ms” UE is considered to be effectively a 10 ms UE in this context.

  If more than two E-AGCH channels are available, as seen under step 13ii, one option (step 16ii) has at least a first clean channel with 10ms TTI, and only 2ms TTI At least a second clean channel may be arranged. Any further configured E-AGCH channel is selectively placed as a clean channel according to either the UE's greatest need or a predetermined transmission interval.

  According to one aspect of the first embodiment, the need for a unique length TTI interval and hence the need for an additional clean channel for a given TTI interval is evaluated. The spacing type for the clean channel with the greatest need can also be said to be the spacing type of the configured channel with the lowest capacity. Capacity is calculated in optional step iii of FIG.

  For 13ii with more than two E-AGCH channelization codes, the method may be arranged so that the TTI spacing of additional clean channels is selected according to the type with the greatest need.

  On a clean 10ms TTI channel, the need to use additional code for 10ms TTI may be greater (as UEs using 2ms TTI are more likely to have 5x fewer transmission opportunities compared to a clean 2ms TTI channel). Given that there are as many as 10 ms TTIs, the third code will typically be allocated for use of 10 ms TTIs because there are fewer transmission opportunities for 10 ms TTIs). On the other hand, when 2 ms TTI serving RL more than 5 times exists, the necessity for transmission of 2 ms TTI becomes larger.

  Whether additional third, fourth and fifth E-AGCH codes should be arranged for use of 2 ms TTI may be based on the capacity of each TTI type.

2 ms total capacity = 5 × “number of configured E-AGCH codes” (2 ms) × 1 / (“number of serving RL” 2 ms)
Total capacity of 10 ms = 1 × “number of configured E-AGCH codes” (10 ms) × 1 / (“number of serving RL” 10 ms)

  Each time there is a third, fourth or fifth empty E-AGCH code, it is placed as a clean channel with a TTI interval corresponding to the existing channel of the given “TTI type” with the lowest capacity. The The lowest capacity for a given type of clean channel can also be said to be the greatest need for a given type of clean channel.

  The calculation is performed under step iii) in FIG.

  Thereafter, in step v, the UE is assigned to a channel with a corresponding TTI interval. In a configuration in which two E-AGCH channelizations are arranged in one cell as one E-AGCH channelization code and 2 ms TTIms code arranged as 10 ms TTI, the NodeB adds 2 ms TTI on two 2 ms channelization codes. Configure all UEs with, and all UEs with 10ms TTI on the other side.

  In FIG. 10, when one downlink control channel code is configured (11i), the downlink control channel is arranged as a composite channel having both the first (P1) and the second interval (P2). (14ii) If two downlink control channel codes are configured (12ii), each of the individual having exclusively the interval of the first interval (P1) or the second interval (P2). The downlink control channel is arranged as a clean channel which is a channel, and one downlink control channel has the first interval (P1), and the second downlink control channel has the second interval (P2). (15ii).

  When at least two downlink control channels are configured (15ii), the assigning step v) assigns UEs (UEs having a first interval) that can exclusively use the first interval (P1) to the first interval (P1). Assigning or reassigning to one clean downlink control channel; and (v); a UE that can use at least the second interval (P2) (second interval type UE) to the second clean down Assigning or reassigning to a link control channel, and (v).

  When more than two downlink control channels are configured, at least the first and second downlink control channels are arranged as clean channels (16ii), and the first downlink control channel is a first channel The second downlink control channel has a transmission interval (P1, P2), the second downlink control channel has a second transmission interval, and the third downlink control channel is, for example, a predetermined first or One of the second transmission intervals (P1, P2) is included.

[Second alternative of the first embodiment]
In FIG. 11, another alternative is shown. This embodiment is similar to the procedure shown in FIG. 10, but step 16ii has been arranged in a different manner and replaced by step 26ii. See further FIG.

  As in the first embodiment, there is at least a first clean channel having 10 ms TTI and a second clean channel having 2 ms TTI. The assignment of UEs to these channels is as described above.

  If more than two E-AGCH channels are available (step 13ii) and a plurality of these channels are actually in operation, the TTI of any newly configured E-AGCH channel The frame arrangement (step 26) is a composite channel arrangement.

  7 and 8, examples of composite type E-AGCH channel arrangement are shown. The actual distribution of the 10 ms TTI interval to the 2 ms TTI interval is predetermined and can be based on empirical values.

  In this example, once additional channels are deployed, further appearing UEs are assigned to three channels according to a load balancing mechanism, which substantially corresponds to the mechanism described below with respect to FIG.

  The load balancing mechanism is particularly preferably dependent on the weight parameters associated with at least the second interval type UE. The cumulative load of each channel continues to be tracked, so that each time an incoming UE appears in the cell and is actually assigned to a channel, that load for the channel to which the UE is assigned is updated. According to the first aspect of the first embodiment, the load value increases by 1 for the second interval type UE, while the load value increases by 5 for the first interval type UE. Other unique incremental load values may be applied.

  Using this mechanism, regular UE distribution is ensured so that channel resources can be used efficiently and the quality of service can be consistent for different types of UEs. This is true at least under the assumption that the UE is equally active.

  As shown in FIG. 11, when more than two downlink control channels are configured, the arrangement of at least the third downlink control channel may be arranged as a composite channel (26ii).

  In FIG. 12, a third alternative of the first embodiment is described.

  In this alternative embodiment, when two downlink control channels are configured, one clean channel according to the transmission interval (P1, P2) having the greatest necessity is arranged, and the other downlink control is performed. The channel code is arranged as a composite channel having both the first and second intervals (P1, P2) (25ii).

  When four downlink control channels are configured, at least one clean channel related to the transmission interval (P1, P2) having the greatest necessity, one clean channel of the first interval (P1), second One clean channel and one composite channel of the interval (P2) are arranged (27ii).

If there is a traffic request such as (13) where more than two downlink control channels are configured, the method
Further arranging (26ii) the third downlink control channel as a composite channel with a first transmission interval (P1) interrupted by a second transmission interval (P2);
A number of first type user entities (UE1) are assigned at least to the first downlink control channel, and a second number of second type user entities (UE2) are assigned to the second downlink control channel. At least a further step (v) of assigning, while
Assign a third number of first type user entities (UE1) to at least a first transmission interval of the third downlink control channel, and assign a fourth number of second type user entities (UE2) to the first Further assigning to the second transmission interval of a third downlink control channel.

  With respect to the aspect of the first embodiment, the scheduling (x) is applied so as to be executed at a higher frequency than the step (i) and the assigning step (vi).

Additionally comprising the step (iii) of calculating the load on all downlink control channels in which the method is configured,
The given transmission interval that the user entity can transmit when more downlink control channels are available for the user entities (UE1, UE2) that can accommodate the given transmission interval (P1, P2) The user entity can be assigned to the downlink control channel having the lowest load and the lowest load.

  Note that the load can be calculated to correspond to the number of user entities assigned to a given downlink control channel.

[Second Embodiment-Calculation of Dynamic Load]
In FIG. 13, another NodeB procedure is shown:
A method for operating a high speed uplink base station including at least one downlink control channel (E-AGCH) scheduled for mobile user entities to receive absolute usage rights, comprising:
The downlink control channel is arranged with a transmission interval corresponding to the first interval (P1) or the second interval (P2),
A candidate for the start of the first transmission interval (P1) is a period corresponding to an integral multiple of the length of the first transmission interval from the predefined (t1) frame on the additional control channel (P-CCPCH). Defined by
Candidates for starting the second transmission interval (P2) are integers of the length of the second transmission interval (P2) from the predefined (t1) frame on the additional control channel (P-CCPCH) Defined by a period equivalent to
The base station can communicate with the first type user entity (UE1) capable of communicating exclusively within the first transmission interval (P1) and within the second transmission interval (P2). Configured to communicate with a second type user entity (UE2).
The above method
Calculating the load on each configured channel; (iii);
Assigning (vi) or reassigning a user entity to each deployed downlink control channel (vi),
Scheduling traffic (x) for user entities assigned at least on a given channel having a transmission interval of the first interval (P1) and / or the second interval (P2);
Including
The ratio of the first interval (P1) to the second interval (P2) changes dynamically.

  Advantageously, the method further comprises a further step of cooperating in the configuration or reconfiguration (i, 10i) of the downlink control channel, where a downlink control channel is added or deleted for the base station. The

  The second embodiment uses the flexible placement with many composite channels shown in FIG. 7 or FIG. 8, and the “place layout” step in a given step before the execution of scheduling is not performed. This is in contrast to the first embodiment. Since the actual scheduling decision affects how “channel configuration” or channel layout is defined over time, the channel configuration of each E-AGCH according to the second embodiment is constant over time. Need not be.

  FIG. 19 shows an example of the second embodiment, which shows a calculation and assignment mechanism corresponding to steps iii and vi of FIG. The load on the first E-AGCH channel A and the load on the second channel B when a new UE of different TTI type is assigned to or leaves the individual channel A / B is represented. UEs are assigned to channels according to the accumulated load on these channels.

  Key C1 indicates that individual channel A or B appears as a clean channel with 10 ms TTI, while key C2 indicates that it appears as a clean 2 ms TTI subframe structure. It appears as a result of scheduling for each channel. M indicates that channel A or B will appear as a composite channel for the time being.

  The frame layout is scheduled during a period such that the downlink control channel includes only the first interval (P1) or the downlink control channel includes only the second interval (P2). It can be seen that the downlink control channel is scheduled as can be done; or the downlink control channel is scheduled to include a composite of the first and second intervals.

  It will be further appreciated that the ratio of the first interval (P1) to the second interval (P2) is scheduled such that the ratio dynamically changes.

  One first alternative of assigning step iii) is performed in the following manner. That is, a weighting factor of 1 is applied to a 2 ms UE, while a 10 ms TTI type UE is associated with a weighting factor of 5.

  According to step vi), the UE is assigned to the E-AGCH with the lowest load at that time. As the UE leaves a channel in a given cell of the NodeB, a value with a corresponding weighting factor is estimated from the accumulated load value associated with the given individual channel. In FIG. 19, incoming UEs are shown as positive numbers, while away UEs are associated with negative signs.

  As mentioned above, the substantially equivalent allocation scheme described under the second embodiment is also used for the embodiments ii and v) for the composite channel embodiment of FIG. It should be understood that It may also be used for more than two E-AGCH channels, and the above scheme is not only a channel arrangement including hybrid of hybrid and clean channels, but also the clean described under the first embodiment. It is also applicable to only channels and composite channels. In these cases, the mechanism is modified so that the user entity is only assigned to channels that can receive absolute usage rights.

[Second Embodiment-Calculation of Alternative Incremental Load Value:]
The load calculation step iii) for the second embodiment can be calculated in various ways according to the invention.

  For example, consider a wireless end user having a laptop device capable of HSDPA and EUL. Comparing the end user's behavior when the EUL part is capable of 2 ms compared to the same user with 10 ms, it can be assumed that the user tends to download more information with 2 ms TTI. The time from “clicking on the web page” to waiting for the page to be completely downloaded and the “next click” being made can be reduced. As a result, it can be assumed that a 2 ms user will require more signaling on the E-AGCH channel. According to an alternative, the load calculation formula is modified by adding additional weighting factors that can be empirically defined to compensate for this expected behavior.

  Instead, the load is calculated by dynamically counting the usage of E-AGCH compared to the maximum capability. For example, the usage amount can be calculated by calculating the usage amount of each E-AGCH in comparison with the maximum capacity of each E-AGCH by the latest sliding window for one second. In this case, the lowest load will appear for the E-AGCH channel with the lowest usage compared to the maximum usage.

  The procedure is shown in FIG. 14: the routine starts at step 30; at 31, it is determined whether an absolute usage right transmission is transmitted from the serving node on any E-AGCH channel. At 32, if this is the case, the absolute usage rights transmission timestamps for all addressed user entities are stored.

  In parallel to the above steps, for example, step 33 is entered every 2 ms, and at 34, for each user entity on each E-AGCH channel, the absolute usage right transmission time stamp for the last time window. A load value of the user entity corresponding to a ratio to a number of time window extensions is calculated. In step 35, for each 2ms (P2) type user entity, the load value of the user entity is multiplied by a weight value, eg, 5, in accordance with the procedure described above. In step 36, the total load value for each E-AGCH channel is calculated by summing the load values of the user entities assigned to each downlink control channel.

  The load on each configured channel is transmitted for that particular user entity within the time window in which the absolute usage right moves (30-32) for each user entity according to the above amount. Calculated using the value of the user entity (34).

  Further, the load value (35) of the user entity may be compensated using a weight value for a user entity that can use the second interval, and the weight value is greater than one.

  FIG. 15 shows an example of a user entity (UE1) with intensive transmission and a UE (UE2) mainly with a fixed rate. An arrow illustrating E-AGCH transmission indicates that an absolute usage right rate change has occurred for the E-AGCH channel to which the user entity is assigned. The direction of the arrow indicates an increase or decrease in allowed transmission capacity.

  According to FIG. 15, user entity UE1 has a load ratio of 23 per time_window, while user entity UE2 has a load ratio of 3 per time_window. This is because the user entity UE1 is associated with a intensive traffic pattern, so there is a higher load on the E-AGCH channel to which UE1 is assigned compared to the load for that individual channel of the user entity UE2. It shows what happens. Concentrated UE1 spends more capacity on the E-AGCH channel than more stationary UE2, even though UE2 transmits more data, at least in the final phase.

  The load of all UEs assigned to a unique E-AGCH code is summed. This is performed for all E-AGCH codes in the cell. According to this alternative of the second embodiment, new user entities entering the system are assigned to the E-AGCH code with the lowest load.

  According to the second embodiment, it is assumed that the scheduling (x) is executed more frequently than the assigning step (vi).

  The load on each configured channel may be calculated by calculating a load value for each user entity assigned to the channel (34), after the user entity is assigned or left to a given channel. The load on a given downlink control channel is calculated as a cumulative load value for the given channel. Incoming user entities are allocated on the channel with the lowest load (vi).

  Instead, the load on each configured channel is the user entity for each user entity according to the amount that an absolute usage right is transmitted (30-32) for that particular user entity within the moving time window. (34).

  The user entity value (35) may be compensated using a weight value for a user entity that can use the second interval, and the weight value is greater than one.

  The frame layout may be scheduled during a period in which the downlink control channel includes only the first interval (P1) or the downlink control channel includes only the second interval (P2). Thus, the downlink control channel is scheduled; or the downlink control channel is scheduled to include a composite of the first and second intervals.

  The ratio of the first interval (P1) to the second interval (P2) is scheduled so that the ratio changes dynamically.

[First and second embodiments-channel configuration]
In the following, with regard to how the Node-B cooperates with the RNC to configure an E-AGCH channel as shown under step i) of FIGS. To explain.

  For example, for a UE requesting HSUPA service, the channelization code is signaled in the RL setup or RL reconfiguration message from the NodeB to the RNC and then forwarded to the UE via the RRC protocol. Thereafter, traffic may be scheduled on a given channel to which the UE is assigned.

  In FIG. 16, known steps according to the NBAP protocol utilized in accordance with the present invention are shown. The RNC notifies the NodeB of the RL setup request 101 (which originates from the user entity (UE)). The NodeB sends an RL setup response 102 that includes radio link allocation (v, vi), i.e., allocation of an E-AGCH code to a given user entity (UE), the code allocation result being: The user entity is notified in the setup message 103 of the RRC radio bearer. Thereby, a given UE is assigned to a given E-AGCH channel.

  In FIG. 17, the RNC process of starting channel configuration (i) for a cell is illustrated. In step 201, an audit request signal is issued. The NodeB signals an audit response signal. In step 203, a cell setup request signal is issued, which is repeated in a cell setup response message (204) from the NodeB. Following this signaling, an R-NC provides an E-AGCH channel to the NodeB in a physical shared channel reconfiguration request (205) for a cell related to the NodeB, and the NodeB uses the E-AGCH channel. Allowed to do. The NodeB then signals consent in the physical shared channel reconfiguration response (206).

  In FIG. 18, a new procedure according to the invention with steps 305, 205-206 is shown, whereby the NodeB first requests the start (305) of reconfiguration of the E-AGCH channel, ie by the NodeB. Configure the E-AGCH to be used or delete the channel for use by the NodeB. The present invention utilizes a new signal shown at 305, for example called "update" of physical shared channel reconfiguration, which is information about the cell ID of the NodeB that generates the reconfiguration start signal 305 and this It contains information on how many E-AGCH channels are required by the NodeB. The remaining steps 205 and 206 are the same as discussed with respect to FIG. 17 and are known according to the NBAP protocol. The resulting configuration or reconfiguration corresponds to step i in FIG.

  In other words, the reconfiguration signal (305) used includes information regarding the cell identity of the base station generating the reconfiguration signal and how many downlink control channels are required by the base station. Is done.

  As illustrated by the above description, according to the present invention, a more efficient utilization of E-AGCH resources is obtained, while a fast response time is generally provided for the UE. With more efficient use of E-AGCH resources, the opportunity for usage rights to be transmitted becomes more frequent and the delay is shorter. Furthermore, the present invention simplifies the processing at the NodeB and consequently the resources required for implementation of the present invention.

  The downlink (DL) capacity in a WCDMA (Wideband Code Division Multiple Access) cell is typically limited by power and / or code. The fewer serving RLs in a cell, the fewer channelization codes are required to transmit absolute usage rights over E-AGCH. The present invention limits the code to be configured based on the number of serving RLs in the cell and whether both 2ms / 10ms TTI are supported.

  In FIG. 5, a user entity UE according to the present invention is shown. The user entity communicates on the DPCCH, E-DPCCH, and E-DPDCH channels by means of L1 processing means, E-RGCH / E-HICH processing means, E-AGCH processing, EUL control means, An EUR controller (ctrl), HARQ processing stages 1 to m for HARQ (Hybrid Automatic Repeat Request) processing 1 to m associated with a user entity (UE), media access control (MAC-e PROC) processing means, including. Furthermore, a buffer I connected to the upper protocol stack of the user entity is provided.

  FIG. 6 shows an example base station according to the present invention, which is also called a NodeB, and can be operated as a serving base station or a non-serving cell. The base station includes E-RGCH / E-HICH processing (PRC) stages 1 to n, Layer 1 processing, E-AGCH processing, a scheduler, and individual HARQ entities for user entities 1 to n. Each HARQ entity includes a plurality of HARQ receivers for receiving packets 1 to m related to HARQ processing for each user entity. In addition, the NodeB includes layer 1 processing means for communicating on the E-AGCH and E-RGCH channels on the air interface, and L1 processing means for communicating on the DPCCH, E-DPCCH and E-DPDCCH channels. Including. Furthermore, the base station includes means for E-DPCH FP for communicating over the iub interface. MAC-e EDPCCH decoding means 1-n are provided to the HARQ entities for UE1-n. According to the present invention, the steps of the method related to Node B according to the present invention may be implemented as a program in a scheduler.

According to a first embodiment of the invention, the mobile user entity is configured for communication on at least one downlink control channel (E-AGCH) scheduled to receive absolute usage rights. A high-speed uplink base station,
The downlink control channel is arranged with a transmission interval corresponding to the first interval (P1) or the second interval (P2),
A candidate for the start of the first transmission interval (P1) is a period corresponding to an integral multiple of the length of the first transmission interval from the predefined (t1) frame on the additional control channel (P-CCPCH). Defined by
Candidates for starting the second transmission interval (P2) are integer multiples of the length of the second transmission interval (P2) from the predefined (t1) frame on the additional control channel (P-CCPCH). Defined by the period of time
The base station can communicate with the first type user entity (UE1) capable of communicating exclusively within the first transmission interval (P1) and within the second transmission interval (P2). Configured to communicate with a second type user entity (UE2),
The base station
A first downlink control channel having a transmission interval of the first interval (10 ms) exclusively is arranged or rearranged, and a first having a transmission interval of the second interval (2 ms) exclusively. (Ii, 11ii-16ii, 27ii) arranging or relocating two downlink control channels;
Assigning or reassigning user entities to each of the deployed downlink control channels,
Scheduling traffic for assigned user entities (x);
A base station configured to perform is provided.

According to a second embodiment of the invention, a high speed configured to communicate at least one downlink control channel (E-AGCH) scheduled for mobile user entities to receive absolute usage rights. An uplink base station,
The downlink control channel is arranged with a transmission interval corresponding to the first interval (P1) or the second interval (P2),
A candidate for the start of the first transmission interval (P1) is a period corresponding to an integral multiple of the length of the first transmission interval from the predefined (t1) frame on the additional control channel (P-CCPCH). Defined by
Candidates for starting the second transmission interval (P2) are integers of the length of the second transmission interval (P2) from the predefined (t1) frame on the additional control channel (P-CCPCH) Defined by a period equivalent to
The base station can communicate with the first type user entity (UE1) capable of communicating exclusively within the first transmission interval (P1) and within the second transmission interval (P2). Configured to communicate with a second type user entity (UE2),
The base station
Calculating the load on each configured channel; (iii);
Assigning (vi) or reassigning a user entity to each deployed downlink control channel (vi),
Scheduling traffic (x) for user entities assigned at least on a given channel having a transmission interval of the first interval (P1) and / or the second interval (P2);
A base station, configured to perform
The ratio of the first interval (P1) to the second interval (P2) changes dynamically.

Claims (11)

A method for operating a high speed uplink base station including at least one downlink control channel scheduled for mobile user entities to receive absolute usage rights, comprising:
The downlink control channel is arranged with a transmission interval corresponding to the first interval or the second interval,
The start of the candidates of the first interval is defined by a period corresponding to an integral multiple length of the first interval from the predefined frame on additional control channel,
The start of the candidate of the second interval is defined by a period corresponding to an integral multiple of the length of the second interval from the predefined frame on the additional control channel,
The base station of the first in between septum between exclusively communicable first type of user entities, and the second second type capable of communicating between septum of the user entity Configured to communicate between
The method
Calculating the load on each configured channel;
Assigning or reassigning user entities to each of the deployed downlink control channels,
Scheduling traffic for user entities assigned at least on a given channel having a transmission interval of the first interval and / or the second interval;
Including
Ratio for the second interval of the first interval in each downlink control channel dynamically changed,
The load on each configured channel is calculated by calculating a load value according to a corresponding transmission interval of a user entity assigned to the channel,
Incoming user entities are allocated on the calculated least loaded channel,
A method characterized by that.   The method of claim 1, wherein the method includes a further step of cooperating in configuration or reconfiguration of a downlink control channel, wherein a downlink control channel is added or deleted for the base station.   The method of claim 1, wherein the scheduling is performed more frequently than the assigning step. As a cumulative load value for the given channel after the user entity assigned or leave the given channel, the load on a given downlink control channel Ru is calculated,
The method according to claim 1.   The load on each configured channel is calculated using a compensation value for each user entity according to the amount of absolute usage rights transmitted for that particular user entity within the moving time window The method according to any one of claims 1 to 3, wherein:   6. The method of claim 5, wherein the load value is compensated using a weight value for a user entity that can use the second interval, the weight value being greater than one.   The frame layout may be scheduled during a period such that the downlink control channel includes only the first interval, or the downlink control channel includes only the second interval. The method according to any of claims 1 to 5, wherein a link control channel is scheduled; or the downlink control channel is scheduled to include a composite of the first and second intervals. The method according to claim 1, wherein a ratio of the first interval to the second interval is scheduled such that the ratio changes dynamically.   The reconfiguration signal is used according to claim 2, comprising information on the cell identity of the base station generating the reconfiguration signal and on how many downlink control channels are required by the base station. the method of.   The method according to claim 1, wherein the downlink control channel is an extended absolute usage right channel. A high speed uplink base station configured to communicate at least one downlink control channel scheduled for mobile user entities to receive absolute usage rights,
The downlink control channel is arranged with a transmission interval corresponding to the first interval or the second interval,
The start of the candidates of the first interval is defined by a period corresponding to an integral multiple length of the first interval from the predefined frame on additional control channel,
The start of the candidate of the second interval is defined by a period corresponding to an integral multiple of the length of the second interval from the predefined frame on the additional control channel,
The base station of the first in between septum between exclusively communicable first type of user entities, and the second second type capable of communicating between septum of the user entity Configured to communicate between
The base station
Calculating the load on each configured channel;
Assigning or reassigning user entities to each of the deployed downlink control channels,
Scheduling traffic for user entities assigned at least on a given channel having a transmission interval of the first interval and / or the second interval;
Is configured to run
Ratio for the second interval of the first interval in each downlink control channel dynamically changed,
The load on each configured channel is calculated by calculating a load value according to a corresponding transmission interval of a user entity assigned to the channel,
Incoming user entities are allocated on the calculated least loaded channel,
A base station characterized by that.

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